Please answer the following question as simply as possible. There is no limit on words but a paragraph would be great. Thank you for your help!

Question 1 of 5

Explain the difference between the null hypothesis and alternative hypothesis. Which one can be proven in a statistical sense?

Question 2 of 5

How can you determine when to use a lower onetailed test of hypothesis versus an upper onetailed test?

Question 3 of 5

Explain the purpose of the chisquare test for independence. Provide some practical examples where this test might be used in business.

Question 4 of 5

Explain the difference between simple and multiple linear regression?

Question 5 of 5

Explain what is the coefficient of determination, R^2 (R-squared)? What does it measure?