Question 5 (10 marks) a. Write the null and alternative hypothesis for the following and determine if it is a two-tailed, a left-tailed or a right-tailed test. i. A researcher is studying the effects...

Extracted text: Question 5 (10 marks) a. Write the null and alternative hypothesis for the following and determine if it is a two-tailed, a left-tailed or a right-tailed test. i. A researcher is studying the effects of radical exercise program on knee surgery patients. There is a good chance the therapy will improve recovery time, but there's also the possibility it will make it worse. Average recovery times for knee surgery patients is 8.2 weeks. ii. Alumni group of a private institution wants to test if the college student, on the average, take less than 4 years to graduate.