View Answered Questions
| No. & Date Asked | Question |
# 521 :: 11/24/08
 |
The width of a confidence estimate for a proportion will be:
a. Narrower for a 99% confidence interval than for a 95% confidence interval.
b. Wider . . .
Confidence Level,
Confidence Intervals,
Proportion |
# 510 :: 11/13/08
|
Survey to determine what proportion of new car buyers continue to have their car serviced at the dealership after warranty ends. Estimates 30% of cust. . .
Sample Size,
Confidence Level |
# 508 :: 11/13/08
|
In a national wide survey a researcher expects 30 percent of the population will agree with an value statement. He wishes to have less than 2% error a. . .
Sample Size,
Margin of Error,
Confidence Level |
# 497 :: 11/6/08
|
A random sample of n=64 children of working mothers showed that they were absent from school an average of 5.3 days per term, with a standard deviatio. . .
Confidence Intervals,
Confidence Level |
# 451 :: 10/3/08
|
A sample of the math test scores of 35 fourth-graders has a mean of 82 with a standard deviation of 15.
Find the 95% confidence interval of the mean. . .
Confidence Intervals,
Confidence Level |
# 403 :: 9/22/08
|
Based on information obtained from a sample of 54, a 98% confidence interval for the average profit level of regional banks is given by 67.4 million t. . .
Standard Deviation,
Margin of Error,
Critical Value,
Confidence Intervals,
Confidence Level |
# 322 :: 8/7/08
|
What effect does an increase in the level of confidence have on the width of the confidence interval?. . .
Confidence Level |
# 58 :: 10/29/07
|
Why don't statisticians calculate 100% confidence intervals?. . .
Confidence Intervals,
Confidence Level |
# 31 :: 10/29/07
|
What is the Z score of a 98% confidence interval?. . .
Confidence Intervals,
Confidence Level |
