- What is the null hypothesis for the ANOVA test? What is the alternative hypothesis?

- In a PCA, what do KMO and Bartlett's Sphericity mean?How do you interpret them during a PCA?

- A high variance inflation factor (VIF) signals what type of problem that needs to be avoided?

1. Non-linearity in correlations
2. Multicollinearity in simple linear regression
3. Sphericity in principal component analysis
4. Multicollinearity in multiple linear regression
5. None of the above
6. Multiple linear regression

thanks in advance