No. & Date Asked  Question 

# 913 :: 12/5/11

The mean is 112 oz, and the standard deviation is 40 oz. Compute the probability that the mean from a sample of 49 will fall between 103 and 121 oz. . .
ZScore,
Area between,
Standard Error of the Mean 
# 897 :: 7/27/11

What is the probability for the following values of Z?
a. Z < 1.35
b. Z > 1.84 and Z < 2.52
c. Z < 1.02 and Z > 2.77. . .
Area between,
ZScore 
# 894 :: 7/17/11

Can percentages be converted to z score?. . .
ZScore 
# 870 :: 11/6/10

A hospital in California uses 100.6 degrees Fahrenheit as the lowest temperature considered to indicate a fever. What percentage of normal and health. . .
ZScore 
# 824 :: 11/8/09

The grades on a statistics midterm test are normally distributed with a mean of 78 and a standard deviation of 6
a. What proportion of the class has . . .
ZScore,
Standard Error of the Mean 
# 815 :: 10/5/09

Shaver Manufacturing, Inc., offers dental insurance to its employees. A recent study by the human resource director shows the annual cost per employee. . .
ZScore,
Area between 
# 813 :: 10/2/09

Serum cholesterol levels were taken from a population of 10,000 college students. The results were normally distributed. Males had a mean of 195 and a. . .
ZScore,
NORMSDIST 
# 804 :: 8/29/09

The mean on this test is 3.5 with a standard deviation of .5. Sally scores 1.5 on this test. How many standard deviations is Sally from the mean?. . .
ZScore 
# 794 :: 8/10/09

A psychologist has developed a test to measure selfcontrol. The test is normed so that it has a mean of 100 and a standard deviation of 15... The s. . .
ZScore,
Percent Score,
Percentile Rank,
Area between 
# 793 :: 8/8/09

For the total population of a large southern city, mean family income is $34000, with a standard deviation (for the population) of $5000.
a. imagi. . .
ZScore 
# 791 :: 8/4/09

Serum cholesterol levels were taken from a population of 10,000 college students. The results were normally distributed. Males had a mean of 195 and a. . .
ZScore 
# 767 :: 6/24/09

IQ scores are normally distributed with a mean of 100 and a std dev of 15. If 25 people are randomly selected for an IQ test, find the probably that . . .
ZScore 
# 739 :: 6/4/09

How many data do we need as a minimum in order to calculate the zscore meaningfully?. . .
ZScore 
# 718 :: 5/5/09

The state of Texas college admission board has set a standard for automatic acceptances to any university at top 10% of any graduating class will be a. . .
ZScore 
# 716 :: 5/5/09

The rockets are playing Lakers tonight in basketball. The lakers average 90 points a game, with a SD of 10. What would the rockets need to score to be. . .
ZScore 
# 715 :: 5/5/09

university of texas will accept all students that have a GPA in the top 10% at their school. At yates the school GPA average is 3.0(on a 4.0 scale) wi. . .
ZScore 
# 714 :: 5/5/09

The mean score on a math test at milby high school was 50. the standard deviation was 10. If the same test was administered to the entire school distr. . .
ZScore 
# 708 :: 4/30/09

Standardized scores offers a way of comparing normreferenced scores. The zscore distribution is based on knowing how many standard deviations away f. . .
ZScore,
tscore,
Percentile Rank 
# 702 :: 4/26/09

A random sample of 100 students who took a statistics exam were asked their score on the exam. The mean score on the test was 50; the standard deviat. . .
ZScore,
Area between 
# 644 :: 3/3/09

An aptitude test has a mean of 220 and standard deviation of 10. find the corresponding z score for: a) a test score of 232 b) a test score of 212. . .
ZScore 
# 621 :: 2/8/09

Consider a sample with data values of 10,20,12,17, and 16. Compute the zscore for each of the five observations. . .
ZScore 
# 618 :: 2/8/09

Individual scores of a placement examination are normally distributed with a mean of 84.2 and a standard deviation of 12.8.
If a random sample of s. . .
ZScore,
tscore 
# 613 :: 2/7/09

I am confused on how to calculate a zscore. I am doing a six sigma project right now and am lost on doing the zscore. Here is the information I am p. . .
ZScore 
# 599 :: 1/30/09

There are two major tests of readiness for college, the ACT and the SAT. ACT scores are reported on a scale from 1 to 36. The distribution of ACT scor. . .
ZScore,
SAT Scores,
ACT Scores 
# 588 :: 1/26/09

An aptitude test has a mean of 220 and standard deviation of 10. find the corresponding z score for: a) a test score of 232. . .
ZScore 
# 572 :: 1/13/09

At one university, students are given zscores at the end of the semester rather than the traditional GPAs. The mean and standard deviation of all stu. . .
Empirical Rule,
ZScore 
# 571 :: 1/10/09

Dr Zak developed a test to measure depression. He sampled 100 university students to take his five item test. The group of students was comprised of 3. . .
ZScore,
Standard Score 
# 559 :: 12/16/08

The serum cholesterol levels for men in one age group are normally distributed with a mean of 185.1 and a standard deviation of 37.8. All units are i. . .
Area between,
ZScore 
# 558 :: 12/16/08

If Z is a standard normal variable, find the probability that z lies between 0.73 and 1.88 or P(0.73
Area between,
ZScore 
# 530 :: 12/2/08

What score would it have taken to be in the 90th percentile in a test with a mean of 40 and standard deviation of 7. . .
ZScore,
Percent Score 
# 524 :: 11/24/08

Discuss how t test can be employed in hypothesis testing by the use of directional vs. nondirectional hypotheses. Discuss types of research where usi. . .
tscore,
ZScore,
directional test,
nondirectional test,
1Sided Test 
# 517 :: 11/22/08

An executive drives his vehicle from home to work daily. Driving times are normally distributed with a mean of 35 minutes and standard deviation of 8. . .
ZScore,
Area between,
above .10 
# 516 :: 11/19/08

Given a mean score of 70, standard deviation of 15,percentile of 23.Find the Z score,T score and raw score.
Please explain how to work backward on a . . .
T score,
Percent Score,
ZScore 
# 502 :: 11/7/08

Administrative staff based at a business school in the UK are advised to take a 15 minute break from their personal computer after working on it for 9. . .
Confidence Intervals,
TDIST,
ttest,
ZScore 
# 500 :: 11/7/08

In a recent year grade 8 Washington State public school students taking a mathematics assessment test had a mean score of 276.1 with a standard deviat. . .
Percent Score,
Area between,
ZScore 
# 494 :: 11/4/08

If the average price of a new home is 145,000 what is the minimum and maximum prices of the houses a contractor will need to build to include the midd. . .
ZScore,
Area between 
# 493 :: 11/4/08

On a police sergeants exam, the historical mean scored was 80 with a standard deviation of 20. Four offiers scored 195,175,191, and 189 respectively. . . .
Empirical Rule,
ZScore,
Unusual Event,
Percent Score 
# 484 :: 10/25/08

With a normal distribution of 50 and standard deviation of population =10, how do I figure out the score at the 40th percentile? How do I figure out t. . .
ZScore,
Area between,
Percent Score 
# 476 :: 10/13/08

Does normal distribution is something to do with Altman ZScore?. . .
Altman ZScore,
ZScore 
# 464 :: 10/7/08

How do you know when to use a tscore instead of a zscore and vice versa?. . .
ZScore,
tscore 
# 462 :: 10/6/08

Olympic Track related question: You know the last 5 race times at the same distance for 8 runners competing in a race. As such, you can calculate the. . .
ZScore 
# 459 :: 10/5/08

How do you calculate a participant score if she was at the 67th percentile? I only have the standard deviation of the population and the mean. s = 27 . . .
Percent Score,
Percentile,
ZScore 
# 428 :: 9/29/08

Each student in an experiment was told to look at 100 cars and count the number of people wearing the seat belts. The mean score for the class was fou. . .
ZScore 
# 423 :: 9/28/08

the lengths of human pregnancies are normally distributed with a mean of 268 days and a standard deviation of 15 days. What is the probability that a . . .
ZScore 
# 420 :: 9/28/08

In one region, the September energy consumption levels for singlefamily homes are found to be normally distributed with a mean of 1050 kWh and a stan. . .
ZScore 
# 417 :: 9/27/08

Could you detail the value of using standard scores (Z scores) to compare relative performance of individual test scores.. . .
ZScore 
# 409 :: 9/24/08

What is the height of a man with the z score of 1.7?. . .
ZScore 
# 401 :: 9/20/08

A woman wrote to DearAbby and claimed that she gave birth 308 days after a visit from her husband, who is in the Navy. Lengths of pregnancies have a . . .
ZScore,
Unusual Event 
# 397 :: 9/19/08

mean score 100,standard deviation 20, z score5 , what is the raw score?. . .
ZScore,
Raw Score from Zscore 
# 390 :: 9/18/08

How do you find the normal distribution when the mean is 50 witha standard deviation between scores of 32 and 47?. . .
Area between,
ZScore 
# 389 :: 9/18/08

How do you dertermine a zscore for continuous data?. . .
ZScore 
# 385 :: 9/16/08

Given that the traveling distance for a population of college students is normally distributed with the mean of 10 kilometers and standard deviation e. . .
ZScore 
# 381 :: 9/13/08

If I know the Tscore for those who made an A on a test is 60, the zscore for those that made a B is .5, the number of students total is 200, how can. . .
ZScore 
# 379 :: 9/11/08

1 a. with a mean of 300 and a standard deviation of 80, how high a score do you need to be in the top 30%?
1 b. What is the interquartile range for. . .
Interquartile Range,
ZScore 
# 378 :: 9/10/08

We have administered an anxiety test to all members of the class. The mean anxiety score is 71 and the standard deviation is 9. (higher score=higher a. . .
ZScore 
# 370 :: 9/6/08

The accounting department at Weston reports that it takes two construction workers a mean of 32 hours and a standard deviation of 2 hours... Determin. . .
Area between,
ZScore 
# 367 :: 9/5/08

find the area under standard normal curve which lies (a) to the right of Z=1.76,(b)to the left of Z=.94,(c)to the right of Z=.65,(d)b/w Z=.34 & Z=.62. . .
Area between,
ZScore 
# 358 :: 8/25/08

In the same set of data,can two or more elements have the same z score.. . .
ZScore 
# 356 :: 8/24/08

The mean weight of 500 students is 151 lbs and the standard deviation is 15 lbs. Assuming the weights are normally distributed, find out how many stu. . .
Area between,
ZScore 
# 349 :: 8/15/08

A bank has determined that the monthly balances of savings accounts of its customers are normaly distributed with an average balance of $1200 and stan. . .
ZScore 
# 348 :: 8/15/08

A random variable X is normal distributed with a mean of 250 and standard deviation of 50. Given that X = 175, what is its corresponding zscore?
Rou. . .
ZScore 
# 334 :: 8/10/08

find the z value so that 20% of the standard normal curve lies to the right of Z. . .
ZScore 
# 333 :: 8/10/08

A woman sells an average of 300 books per month, with a standard deviation of 50. Over the next ten years, how many months will she sell more than 375. . .
ZScore 
# 318 :: 8/6/08

A traffic study at one point on an interstate highway shows that vehicle speeds are normally distributed with a mean of 61.3 mph and a standard deviat. . .
Area between,
ZScore 
# 299 :: 7/30/08

random variable x is normally distributed with mean of 250 and standard deviation of 50 find zscore for x=175. . .
ZScore 
# 295 :: 7/28/08

How can I calculate a Z score with only the mean and the standard deviation?. . .
ZScore 
# 294 :: 7/28/08

A test is normally distributed with a mean of 40 and a standard deviation of 7. (a) What score would be needed to be in the 85th percentile?. . .
ZScore,
Percentile,
Percentile Rank 
# 293 :: 7/28/08

How can you use a Z score to interpret data in a school. . .
ZScore 
# 289 :: 7/25/08

A standard I.Q. test produces normally distributed results with a mean of 100 and a standard deviation of 15. If an average I.Q. is defined to be any . . .
ZScore,
IQ Score 
# 283 :: 7/19/08

The lengths of pregnancies are normally distributed with a mean of 264 days and a standard deviation of 25 days. If 100 women are randomly selected, f. . .
ZScore,
Area between 
# 277 :: 7/14/08

If an A is given to a student who scores 90% or above, what would the minimum zscore be for a 300 multiple choice question test with a mean of 195 an. . .
ZScore 
# 275 :: 7/11/08

The lowest 25% of the normal distribution falls below what zscore and tscore. . .
T score,
ZScore 
# 269 :: 7/9/08

A classical experiment in extrasensory perception (ESP) consists of asking a subject to tell, without looking, the suit of each card in a deck of Zene. . .
ZScore,
Binomial Probability,
Normal Approximation,
binomial,
BINOMDIST 
# 262 :: 7/3/08

with a mean of 150 and a standard deviation of 15 what is the probability of a student having a weight of less than 178 lbs.. . .
ZScore 
# 260 :: 7/1/08

Suppose that the scores of architects on a particular creativity test are normally distributed. What percentage of architects have Z scores (a) above . . .
ZScore 
# 253 :: 6/26/08

What are the 2 advantages of using Z power?
If the z score is less than 0, what can be said of the corresponding raw score?
If the z score is great. . .
ZScore 
# 249 :: 6/24/08

A nationally standardized test is scaled so that the normally distributed scores have a mean of 80 and a standard deviation of 10 in the population. I. . .
ZScore 
# 247 :: 6/24/08

Jeff:
Can you possibly share the actual formula you are using in this application to produce the Adjusted Wald calculations?
Thanks. . .
Adjusted Wald,
ZScore,
Confidence Intervals 
# 239 :: 6/16/08

I have a data set where n=20. My problem is to find the score at exactly the 75th percentile assuming normality. I know the formula for zscore, the. . .
ZScore 
# 233 :: 6/13/08

Between what two values of Z will 88% of the middle data values fall between?. . .
ZScore 
# 232 :: 6/12/08

If a distribution of test scores is normal with a mean of 78 and a standard deviation of 11, what percent of the area lies below 60. . .
ZScore 
# 230 :: 6/11/08

a score that is 8 points above the mean corresponds to a zscore=0.05 What is the population standard deviation?. . .
Standard Deviation,
ZScore 
# 219 :: 6/6/08

A z score of 1.04 shows a percentage value of?. . .
ZScore 
# 210 :: 5/29/08

My local coffee house sells Colombian coffee beans to supermarkets in bags labelled 100g each.
The tolerance of the automatic filling machine, lead. . .
ZScore 
# 207 :: 5/24/08

Suppose that the scores of architects on a particular creativity test are normally distributed.What percentage of architects have Z scores. (a) abov. . .
ZScore 
# 206 :: 5/24/08

The variable Z has a standard Normal distribution.
a) Find the number z that has cumulative proportion 0.85.
b) Find the number z such that the eve. . .
ZScore 
# 205 :: 5/22/08

Find the number z that has cumulative proportion 0.8. . .
ZScore 
# 204 :: 5/22/08

What does a z value mean?. . .
ZScore,
Zvalue,
Standard Score 
# 202 :: 5/21/08

Site preparation for new housing developments for tracts of 40 houses is normally distributed with a mean of 250 workdays and a standard deviation of . . .
ZScore 
# 186 :: 5/9/08

how does altman build zscore? please send to my email the process of building this score!. . .
Altman ZScore,
ZScore 
# 177 :: 5/2/08

Find the probability that a randomly selected adult has an IQ that is less than 130. . .
IQ Score,
ZScore 
# 176 :: 4/30/08

In a 0netail test (l side) with z score of 1.645, what are the percentages for critical value and noncritical value?. . .
OneTailed Area,
ZScore,
Critical Value 
# 173 :: 4/27/08

why can you not have a z score equaling 0/0 ? what is problematic with calcutlating a zscore for a data set of repeated entries?. . .
ZScore 
# 170 :: 4/25/08

If last six month average defect rate is 5% then what will be the process Zst score?
. . .
1.5 Sigma Shift,
ZScore,
Z Short Term 
# 161 :: 4/21/08

z Scores lenths are measured in centameters, does it have to be converted to a different unit of measurment? . . .
ZScore 
# 157 :: 4/17/08

With a z score of 1.5, what percentage often scores are above 52 and what percentage of the scores are above 60?. . .
ZScore 
# 146 :: 4/9/08

what is the zscore that corresponds to the 20th percentile of the normal distribution. . .
ZScore,
Percentile 
# 137 :: 4/4/08

What score would Sandra need to beat 91 percent of her mathematics class? The mean score was 73, and the standard deviation was 12.. . .
ZScore 
# 135 :: 3/31/08

I am conducting a ring test where 6 laboratories were asked to measure protein levels in the same flour sample. I then calculated the z score for each. . .
ZScore 
# 128 :: 3/25/08

What is the value of z score required for a 70% confidence interval?. . .
ZScore,
,
Confidence Intervals 
# 114 :: 3/16/08

The mean on this test is 3.5 with a standard deviation of .5. Billy scores 5. What is the standard score?. . .
Standard Score,
ZScore 
# 96 :: 3/1/08

The mean is ì = 60.0 and the standard deviation is ó = 4.0.
Find the probability that X is less than 53.0.. . .
ZScore 
# 70 :: 12/10/07

The grades on the midterm given in a large managerial stats class are normally distibuted with mean 75 and standard deviation 9. Instructors of this c. . .
ZScore,
Percentile 
# 48 :: 10/29/07

Suppose that the scores of architects on a particular creativity test are normally distributed. What percentage of architects have Z scores? a. above . . .
ZScore 
# 42 :: 10/29/07

What are the units of zscore?. . .
ZScore,
Units of Measure 
# 41 :: 10/29/07

On a scale from 0 to 100, the mean level of economic development among the countries in the world is 65 and the standard deviation is 10. What proport. . .
ZScore,
Standard Normal Curve 
# 39 :: 10/29/07

What is the basic formula for the zscore other than table of areas?. . .
NewtonRaphson,
ZScore 
# 38 :: 10/29/07

Alexa got 144 on her test which has a mean of 128 and a standard deviation of 34. What is her zscore?. . .
ZScore,
example 
# 37 :: 10/29/07

How do you calculate the z score for the raw score of 10 based on the following distribution: 8, 9, 15, 30, 7, 8 ?. . .
ZScore,
Standard Deviation 
# 33 :: 10/29/07

How do you find a z score such that 8% of the area under the curve is to the right of Z?. . .
ZScore,
OneSided Area 
# 29 :: 10/29/07

How do you calculate a zscore on discrete data?. . .
ZScore,
Discrete Data 
# 26 :: 10/29/07

How do you calculate zscores from batting averages?. . .
ZScore 
# 25 :: 10/29/07

What does a Zscore look like on a graph?. . .
ZScore 
# 17 :: 10/29/07

Having obtained the z score and then derived the percentage... what does the percentage tell you?. . .
Unusual Event,
ZScore 
# 15 :: 10/23/07

How do you calculate a Zscore with a twosided specification limit? What is the DPMO?
I have a lower spec limit of 0.008 and an uppers spec lim. . .
DPMO,
ZScore,
Process Sigma,
Zupper 
# 14 :: 10/23/07

What percent of the time should this occur? (ZScore) ?. . .
ZScore,
Normally Distributed,
Standard Deviation,
Normal Curve 
# 13 :: 10/23/07

How unusual is this event (ZScore)?
A department store, on average, has daily sales of $28,707.47. The standard deviation of sales is $1000. . . .
ZScore,
Unusual Event 
# 12 :: 10/23/07

Can a z score be calculated by input of a proportion only?. . .
Proportion,
ZScore 
# 11 :: 10/23/07

What is the z value for 1.648?. . .
ZScore 
# 10 :: 10/23/07

What is the difference between a ZScores and Process Sigma?. . .
Process Sigma,
ZScore,
1.5 Sigma Shift 
# 4 :: 10/23/07

Where can I find a Z score chart ?. . .
ZScore 
# 3 :: 10/23/07

What is the critical z score for a one tailed test with alpha = .01.. . .
Alpha,
ZScore 
# 2 :: 10/23/07

Joe received a z score of 1.50 on a classroom test. This means that, compared to his classmates, Joe's score was...?. . .
ZScore,
1.5,
lambda 