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