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9 Questions returned
No. & Date AskedQuestion
# 521 :: 11/24/08
Question 521 has been Answered
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
Question 510 has been Answered
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
Question 508 has been Answered
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
Question 497 has been Answered
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
Question 451 has been Answered
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
Question 403 has been Answered
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
Question 322 has been Answered
What effect does an increase in the level of confidence have on the width of the confidence interval?. . .

Confidence Level

# 58 :: 10/29/07
Question 58 has been Answered
Why don't statisticians calculate 100% confidence intervals?. . .

Confidence Intervals, Confidence Level

# 31 :: 10/29/07
Question 31 has been Answered
What is the Z score of a 98% confidence interval?. . .

Confidence Intervals, Confidence Level