Which of the followings is correct in diagnosing a multiple

Which of the followings is correct in diagnosing a multiple linear regression? Choose all correct answers.

a. Shapiro-Wilk Test and Kolmogorov-Smirnov Test are used to check for outliers.

b. Box-Cox Transformations are employed when there are outliers.

c. A small p-value in Shapiro-Wilks test concludes that there exists a multicollinearity problem in the data set.

d. Examining the normal probability plot of residuals can detect outliers.

e. All outliers are inuential points.

Solution

a. Not correct. Use these test for normality

b.  to create a monotonic transformation, not correct

d. correct ,  Examining the normal probability plot of residuals can detect outliers.

e. Not correct, some outlier may not be influential