# Thread: How do you find the p-value of two means when they're independent samples?

1. ## How do you find the p-value of two means when they're independent samples?

I am in statistics and having major trouble finding out how to do this. I have looked everywhere - my textbook firstly which contains no info on this. I had the math program walk me through it but it skips over HOW to do it of course. I have googled like crazy. Someone please help!!

The problem is as follows:

A study was done using a treatment group and a placebo group. The results are shown in the table. Assume that the two samples are independent simple random samples selected from the normally distributed populations, and do not assume that the population standard deviations are equal. Complete parts a and b. The picture I am attaching does not show part b cause I had not answered part a yet. I know what part a is.. the answer is c but I need help with finding the p-value. Part b asks for the p-value. Thanks in advance for any help!

2. ## Re: How do you find the p-value of two means when they're independent samples?

Hey asinks01.

In terms of your hypotheses, unless you have additional constraints on the parameters, you are going to to use the general form.

If means are the same then mu1 = mu2. What is the complement of this if you have no extra restrictions?

Hint: You need to think about what distributon and test-statistic you need to use (take a look at the various t-statistics for difference of means). Ask yourself whether you need paired or pooled t-tests first and then decide based on that what test statistic you used. (There are three 2-sample test statistics: paired, pooled, or un-paired/un-pooled).

3. ## Re: How do you find the p-value of two means when they're independent samples?

As this is an online class where you teach yourself, I wasn't really asking for veiled hints as to how to do this problem. Anyone else actually know how to do this problem? I would appreciate it.