# 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.**

(37.49, 38.51)

(36.49, 39.51)

(35.45, 40.55)

(25.26, 50.74)

**Question 4 out of 5.**

(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