APFIVE Sample Size and Slope Confidence Interval Width
A researcher doubles the sample size in a linear regression study from n = 40 to n = 80. If the original 95% confidence interval for the slope was (0.35, 0.65), which of the following is the best approximation of the new confidence interval width, assuming all other factors remain constant?
A
0.42
B
0.21
C
0.30
D
0.15
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