/sci/ - Science & Math

/sci/, I humbly come before you this evening asking for any help that may be given

I'm taking a statistics class with a professor who does not actually teach us anything, yet expects us to understand the homework

I managed to figure out most of the homework assigned from the book, but there are two problems that I cannot get, which deal with the comparison between two population means


1. Two methods of teaching were applied to two randomly selected groups. The sample means and variances computed from test scores are shown below. Do the data present sufficient evidence to indicated a difference in the mean scores for the populations associated with the
two teaching methods? What can be said about the attained significant level? What assumptions are required? What would you conclude at the alpha = .05 level of significant?
n Method 1: 11
̅y Method 1: 64
s^2 Method 1: 52
n Method 2: 14
̅y Method 2: 69
s^2 Method 2: 71


2. The strength of concrete depends on the method used for drying it. Two different drying methods yielded the results below for independently test specimen. Do the methods appear to produce concrete with different mean strengths? Use alpha = .05. What is the attained significance level?
n Method 1: 7
̅y Method 1: 3250
s Method 1: 210
n Method 2: 10
̅y Method 2: 3240
s Method 2: 190