5.You are testing a claim about two population means in which independent sample

Question

5.You are testing a claim about two population means in which independent samples were used. If one sample contained 20 measurements and the other contained 15, how many degrees of freedom would you use in your hypothesis test?

6. A researcher claims that milk purchased from Fred Meyer lasts (on average) the same number of days that milk purchased from Safeway does. In order to test this claim, you would use a _________-tailed test.

7. In a hypothesis test involving paired differences, the value that is given to d in the null hypothesis is _____.

8. True or False: It is possible to prove claims by using statistics.

9. True or false: Rejecting a null hypothesis means that the alternative hypothesis is definitely true.

10. If you want to determine if there is a difference between test scores before a workshop and test scores after a workshop, which would be the alternative hypothesis?

11.Which of the following claims could be an alternative hypothesis? Select ALL that apply.

12. Find the critical value(s) that would be used to test the hypothesis d> 0. Assume a 0.01 level of significance and a sample of 21 individuals.

13. Find the critical value(s) that would be used to test the hypothesis that 1 2 using a 0.05 level of significance. Assume that both samples consisted of 15 individuals.

please show work

Explanation / Answer

Question 5)

Df = n1+n2 -2

     = 20 + 15 – 2

     = 33

Answer: ( c ) 33

Question 6)

Here the claim is non directional.

Answer: ( a ) two

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