Confidence Intervals for the Mean
Confidence Interval on the Mean
Questions
Question 1 out of 5.
You know the mean and standard deviation of the population. You take a sample from this population and compute the 90% confidence interval for the mean. This interval contains values that are within how many standard deviations of the mean?
Question 2 out of 5.
There is a population of test scores. You take a sample of 11 scores and use them to estimate the population mean and standard deviation. Then you compute a 95% confidence interval for the mean. This confidence interval contains values that are within how many standard deviations of its mean?
Question 3 out of 5.
You take a sample (N = 25) of test scores from a population. The sample
mean is 38, and the population standard deviation is 6.5. What is the
95% confidence interval on the mean? (37.49, 38.51)
(36.49, 39.51)
(35.45, 40.55)
(25.26, 50.74)
Question 4 out of 5.
You take a sample (N = 9) of heights of fifth graders. The sample mean
was 49, and the sample standard deviation was 4. What is the 99%
confidence interval on the mean? (39.76, 58.24)
(44.53, 53.47)
(45.93, 52.07)
(47.51, 50.49)
Question 5 out of 5.
Based on the data below, what is the upper limit of
the 95% confidence interval for the mean of A1? You may want to use the
Analysis Lab or another statistical program to answer this.
________
A1 1 4 5 5 7 9 10 11 12 13 14 14 17 19 20 23 24 24 24
29