For this project, include the Minitab worksheet and session window.

Also, answer this page, filling in all results.

1) To obtain an estimate for the mean age of students enrolled in evening classes, a sample of 30 evening students was surveyed. The following is a list of the ages of the students in the sample. Type the data into a Minitab worksheet.

18 18 19 19 20 20 20 20 21 21 21 21 22 22 22 23 23 24 26 26 27 28 30 30 32 35 36 36 41 45

a) Give the point estimate for the mean age of students enrolled in evening classes.

b) The age of students enrolled in evening classes is normally distributed. Give the 95% confidence interval for .

2) The mean age of all evening students is reported by the local newspaper to be 24 years. Is there any evidence, at the 0.05 level of significance, to suggest that the mean age of students enrolled in evening classes is greater than that reported by the newspaper? Use the sample data above as evidence, and use Minitab to calculate the p-value. Make a decision about H0 and state the conclusion with regards to H1.

Null hypothesis:

Alternative hypothesis:

p-value from minitab:

Compare p-value to alpha:

State your conclusion:

Minitab Directions: Confidence Intervals Stat > Basic Statistics > 1- Sample Z OR 1- Sample t (you need to decide which one you should use) Samples in columns: specify column Options: Confidence level: specify Alternative: select "not equal"

Hypothesis Tests Stat > Basic Statistics > 1- Sample Z OR 1- Sample t Samples in columns: specify column Check box for Perform Hypothesis Test Hypothesized mean: enter mu, the hypothesized mean Options: Confidence level: specify Alternative: select the appropriate alternative hypothesis