Sample Size and Slope Confidence Interval Width
A 95 percent confidence interval for the slope in a linear regression analysis is (0.35, 0.65), based on a sample of size n = 40. If the sample size is increased to n = 80 while holding all other factors constant, which of the following is the best approximation for the width of the new confidence interval?
A
0.42
B
0.15
C
0.21
D
0.30
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