1.Appraise TWO (2) ways to do cross validation for a model after running Linear Regression.

2.b) Infer the null and alternative hypotheses for the following questions:

(i) 'Is there a relationship between the number of days before an exam and the amount of hours a student studies?'

(4 marks)

(ii) 'Does getting at least eight hours of sleep reduce your likelihood of having heart problems?'

(4 marks)