Question

Independent Samples T-test

1. If n1 = 100 and n2 = 100, determine the critical value of t for an independent samples t test, two-tailed alpha = .05.

2. Calculate pooled variance: n1 = 12, s21 = 7.4 and n2 = 13, s22 = 8.2

3. A physician compared the cholesterol levels of a representative sample of Americans who are an American diet vs a representative sample who followed a Mediterranean diet. American diet (control): M = 230, s2 = 24, n = 36; Mediterranean diet (experimental): M = 190, s2 = 26, n = 36. Go through the hypothesis testing steps to write your hypotheses, identify the critical t value, and t value.

4. A nutritionist compared the effectiveness of an online diet program to that of an in-person diet program. After three months, she compared the number of pounds of weight lost. The control (in-person) group lost a mean of 18 pounds (n = 16, s2 = 14.50) and the experimental group (online) lost 16 pounds ( n = 21, s2 = 13.30). Go through the hypothesis testing steps to write your hypotheses, identify the critical t value, and t value.

Answer 1

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