A researcher believes that taking vitamin E reduces the severity of colds. 100 participants are randomly assigned so that 50 are in the experimental group (take vitamin E) and 50 are in the control group (take a placebo). Over the course of a year the lengths of each cold for all the participants are recorded, with the following results:

Vitamin E

= 4days

s1= 3 days

Control Group

= 7 days

s2= 5 days

Testing at significance level a = .05, Find:

Question 5

H0and Ha:

Group of answer choices

H0: 1< 2

Ha: 1= 2

H0: 1= 4

Ha: 1< 4

H0: 1= 2

Ha: 1< 2

H0: 1= 4

Ha: 2 = 7