APFIVE Degrees of Freedom for Regression Slope
A researcher collected data on advertising expenditures (x) and sales revenue (y) for 25 retail stores. Which t-distribution should be used when constructing a 90% confidence interval for the slope of the regression line?
A
Standard normal distribution (z-distribution)
B
t-distribution with 23 degrees of freedom
C
t-distribution with 25 degrees of freedom
D
t-distribution with 24 degrees of freedom
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