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No. & Date Asked  Question 

# 31 :: 10/29/07

What is the Z score of a 98% confidence interval?. . .
Confidence Intervals,
Confidence Level 
# 58 :: 10/29/07

Why don't statisticians calculate 100% confidence intervals?. . .
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 
# 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 
# 451 :: 10/3/08

A sample of the math test scores of 35 fourthgraders has a mean of 82 with a standard deviation of 15.
Find the 95% confidence interval of the mean. . .
Confidence Intervals,
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 
# 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 
# 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 
# 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 