View Answered Questions
| 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 |
# 520 :: 11/23/08
|
Your company asks you to compare a new advertising campaign and the old one. Sample data on the accounts as follows:
Old: 40, 28, 35, 38, 31, 42, 26,. . .
Confidence Intervals,
Median,
Mode,
mean,
t-statistic,
Standard Error of the Mean |
# 512 :: 11/14/08
|
When estimating the mean of a population, how large must the sample be in order that the 95% error margin is 1/8 the standard deviation?. . .
Sample Size,
Margin of Error,
Standard Deviation,
Standard Error of the Mean |
# 485 :: 10/27/08
|
Assume that the heights of 5 year old boys are normally distribued with a mean of 100cm and a standard deviation of 60. What is the sampling distribut. . .
TINV,
Confidence Intervals,
Standard Error of the Mean,
Standard Deviation of the Mean |
# 391 :: 9/18/08
|
An engineer in an automotive factory wishes to know what the tire pressure is on all cars leaving the factory. She measures the tire pressure on a sa. . .
Standard Error of the Mean,
t-statistic,
Confidence Intervals,
Critical Value |
# 315 :: 8/5/08
|
An engineer in an automotive factory wishes to know what the tire pressure is on all cars leaving the factory. She measures the tire pressure on a sa. . .
Standard Error of the Mean,
Standard Deviation,
Confidence Intervals,
Critical Value,
t-statistic |
# 151 :: 4/14/08
|
A random sample of 25 households finds that an average of 2.3 people reside in each house (the standard deviation is 0.35). With a 95% confidence lev. . .
TINV,
t-statistic,
t-distribution,
Confidence Intervals,
Standard Error of the Mean,
Margin of Error |
