Sample Size and Confidence Interval for Slope
A 95% confidence interval for the slope of a regression line, based on a sample of size n = 50, is (1.2, 2.8). If the sample size were increased to n = 200 while the sample slope, sx, and σ remained the same, what would be the approximate new 95% confidence interval?
A
(1.6, 2.4)
B
(0.6, 3.4)
C
(1.2, 2.8)
D
(1.45, 2.55)
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