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Confidence interval for the mean act score

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Reference no: EM131826824

The data set actgpa contains the ACT composite scores and GPAs of some randomly selected seniors at a Midwest liberal arts college.

a) Give a 95% confidence interval for the mean ACT score of seniors at this school.

b) Give a 95% confidence interval for the mean GPA of seniors at this school.

c) What fraction of the variation in GPAs is explained by a student's ACT score?

d) Use the data to estimate with 95% confidence the average GPA for a student who scored 25 on the ACT.

e) Suppose you know a high school student who scored 30 on the ACT. Estimate with 95% confidence his GPA as a senior in college.

f) Are there any reasons to be concerned about the analyses you have just done? Explain.

Reference no: EM131826824

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