Apply Procedure 14.2 to find and interpret a confidence interval, at the specified confidence level, for the
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Apply Procedure 14.2 to find and interpret a confidence interval, at the specified confidence level, for the slope of the population regression line that relates the response variable to the predictor variable
Procedure 14.2
Purpose To find a confidence interval for the slope, β1, of the population regression line.
Assumptions The four assumptions for regression inferences
Step 1
For a confidence level of 1 — α, use to find ta/2 with df = n — 2.
Step 2
The endpoints of the confidence interval for ß1 are
Step 3
Interpret the confidence interval.
Refer to Exercise 14.63; 99%.
Exercise 14.63
Following are the data on total hours studied over 2 weeks and test score at the end of the 2 weeks from Exercise 14.27. Use α = 0.01.
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