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No. & Date Asked	Question
# 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 . . . Z-Score, 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. . . Z-Score, 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. . . Z-Score, 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?. . . Z-Score
# 794 :: 8/10/09	A psychologist has developed a test to measure self-control. The test is normed so that it has a mean of 100 and a standard deviation of 15... The s. . . Z-Score, 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. . . Z-Score
# 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. . . Z-Score
# 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 . . . Z-Score
# 739 :: 6/4/09	How many data do we need as a minimum in order to calculate the z-score meaningfully?. . . Z-Score
# 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. . . Z-Score
# 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. . . Z-Score
# 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. . . Z-Score
# 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. . . Z-Score
# 708 :: 4/30/09	Standardized scores offers a way of comparing norm-referenced scores. The z-score distribution is based on knowing how many standard deviations away f. . . Z-Score, t-score, 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. . . Z-Score, 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. . . Z-Score
# 621 :: 2/8/09	Consider a sample with data values of 10,20,12,17, and 16. Compute the z-score for each of the five observations. . . Z-Score
# 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. . . Z-Score, t-score
# 613 :: 2/7/09	I am confused on how to calculate a z-score. I am doing a six sigma project right now and am lost on doing the z-score. Here is the information I am p. . . Z-Score
# 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. . . Z-Score, 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. . . Z-Score
# 572 :: 1/13/09	At one university, students are given z-scores at the end of the semester rather than the traditional GPAs. The mean and standard deviation of all stu. . . Empirical Rule, Z-Score
# 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. . . Z-Score, 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, Z-Score
# 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, Z-Score
# 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. . . Z-Score, 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. . . t-score, Z-Score, directional test, nondirectional test, 1-Sided 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. . . Z-Score, 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, Z-Score
# 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, t-test, Z-Score
# 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, Z-Score
# 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. . . Z-Score, 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, Z-Score, 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. . . Z-Score, Area between, Percent Score
# 476 :: 10/13/08	Does normal distribution is something to do with Altman Z-Score?. . . Altman Z-Score, Z-Score
# 464 :: 10/7/08	How do you know when to use a t-score instead of a z-score and vice versa?. . . Z-Score, t-score
# 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. . . Z-Score
# 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, Z-Score
# 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. . . Z-Score
# 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 . . . Z-Score
# 420 :: 9/28/08	In one region, the September energy consumption levels for single-family homes are found to be normally distributed with a mean of 1050 kWh and a stan. . . Z-Score
# 417 :: 9/27/08	Could you detail the value of using standard scores (Z scores) to compare relative performance of individual test scores.. . . Z-Score
# 409 :: 9/24/08	What is the height of a man with the z score of -1.7?. . . Z-Score
# 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 . . . Z-Score, Unusual Event
# 397 :: 9/19/08	mean score 100,standard deviation 20, z score-5 , what is the raw score?. . . Z-Score, Raw Score from Z-score
# 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, Z-Score
# 389 :: 9/18/08	How do you dertermine a z-score for continuous data?. . . Z-Score
# 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. . . Z-Score
# 381 :: 9/13/08	If I know the T-score for those who made an A on a test is 60, the z-score for those that made a B is .5, the number of students total is 200, how can. . . Z-Score
# 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, Z-Score
# 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. . . Z-Score
# 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, Z-Score
# 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, Z-Score
# 358 :: 8/25/08	In the same set of data,can two or more elements have the same z score.. . . Z-Score
# 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, Z-Score
# 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. . . Z-Score
# 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 z-score? Rou. . . Z-Score
# 334 :: 8/10/08	find the z value so that 20% of the standard normal curve lies to the right of Z. . . Z-Score
# 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. . . Z-Score
# 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, Z-Score
# 299 :: 7/30/08	random variable x is normally distributed with mean of 250 and standard deviation of 50 find z-score for x=175. . . Z-Score
# 295 :: 7/28/08	How can I calculate a Z score with only the mean and the standard deviation?. . . Z-Score
# 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?. . . Z-Score, Percentile, Percentile Rank
# 293 :: 7/28/08	How can you use a Z score to interpret data in a school. . . Z-Score
# 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 . . . Z-Score, 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. . . Z-Score, Area between
# 277 :: 7/14/08	If an A is given to a student who scores 90% or above, what would the minimum z-score be for a 300 multiple choice question test with a mean of 195 an. . . Z-Score
# 275 :: 7/11/08	The lowest 25% of the normal distribution falls below what z-score and t-score. . . T score, Z-Score
# 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. . . Z-Score, 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.. . . Z-Score
# 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 . . . Z-Score
# 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. . . Z-Score
# 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. . . Z-Score
# 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, Z-Score, 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 z-score, the. . . Z-Score
# 233 :: 6/13/08	Between what two values of Z will 88% of the middle data values fall between?. . . Z-Score
# 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. . . Z-Score
# 230 :: 6/11/08	a score that is 8 points above the mean corresponds to a z-score=0.05 What is the population standard deviation?. . . Standard Deviation, Z-Score
# 219 :: 6/6/08	A z score of 1.04 shows a percentage value of?. . . Z-Score
# 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. . . Z-Score
# 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. . . Z-Score
# 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. . . Z-Score
# 205 :: 5/22/08	Find the number z that has cumulative proportion 0.8. . . Z-Score
# 204 :: 5/22/08	What does a z value mean?. . . Z-Score, Z-value, 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 . . . Z-Score
# 186 :: 5/9/08	how does altman build z-score? please send to my email the process of building this score!. . . Altman Z-Score, Z-Score
# 177 :: 5/2/08	Find the probability that a randomly selected adult has an IQ that is less than 130. . . IQ Score, Z-Score
# 176 :: 4/30/08	In a 0ne-tail test (l side) with z score of 1.645, what are the percentages for critical value and non-critical value?. . . One-Tailed Area, Z-Score, Critical Value
# 173 :: 4/27/08	why can you not have a z- score equaling 0/0 ? what is problematic with calcutlating a z-score for a data set of repeated entries?. . . Z-Score
# 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, Z-Score, 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? . . . Z-Score
# 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?. . . Z-Score
# 146 :: 4/9/08	what is the z-score that corresponds to the 20th percentile of the normal distribution. . . Z-Score, 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.. . . Z-Score
# 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. . . Z-Score
# 128 :: 3/25/08	What is the value of z score required for a 70% confidence interval?. . . Z-Score, , 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, Z-Score
# 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.. . . Z-Score
# 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. . . Z-Score, 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 . . . Z-Score
# 42 :: 10/29/07	What are the units of z-score?. . . Z-Score, 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. . . Z-Score, Standard Normal Curve
# 39 :: 10/29/07	What is the basic formula for the z-score other than table of areas?. . . Newton-Raphson, Z-Score
# 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 z-score?. . . Z-Score, 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 ?. . . Z-Score, 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?. . . Z-Score, One-Sided Area
# 29 :: 10/29/07	How do you calculate a z-score on discrete data?. . . Z-Score, Discrete Data
# 26 :: 10/29/07	How do you calculate z-scores from batting averages?. . . Z-Score
# 25 :: 10/29/07	What does a Z-score look like on a graph?. . . Z-Score
# 17 :: 10/29/07	Having obtained the z score and then derived the percentage... what does the percentage tell you?. . . Unusual Event, Z-Score
# 15 :: 10/23/07	How do you calculate a Z-score with a two-sided specification limit? What is the DPMO? I have a lower spec limit of -0.008 and an uppers spec lim. . . DPMO, Z-Score, Process Sigma, Z-upper
# 14 :: 10/23/07	What percent of the time should this occur? (Z-Score) ?. . . Z-Score, Normally Distributed, Standard Deviation, Normal Curve
# 13 :: 10/23/07	How unusual is this event (Z-Score)? A department store, on average, has daily sales of $28,707.47. The standard deviation of sales is $1000. . . . Z-Score, Unusual Event
# 12 :: 10/23/07	Can a z score be calculated by input of a proportion only?. . . Proportion, Z-Score
# 11 :: 10/23/07	What is the z value for 1.648?. . . Z-Score
# 10 :: 10/23/07	What is the difference between a Z-Scores and Process Sigma?. . . Process Sigma, Z-Score, 1.5 Sigma Shift
# 4 :: 10/23/07	Where can I find a Z score chart ?. . . Z-Score
# 3 :: 10/23/07	What is the critical z score for a one tailed test with alpha = .01.. . . Alpha, Z-Score
# 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...?. . . Z-Score, 1.5, lambda

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