16 Find the critical value for a 2 tailed t test when a = .02 n = 22 17 If p = .23, n = 121, p-hat = .25, what is Z ? 18 Claim: p mu 2, alpha =.10, x bar 1 = 520, x bar 2 = 510, sigma1 = 30, sigma2 = 20, n1 = 100, n2 = 80, calculate the test statistic & the standardized test statistic. 23 In a 2 tail test of the difference between means for large independent samples, if s1 = 13,000, s2 = 15,000, n1 = 100, n2 = 49 calculate the standard error 24 For a 2 sample t test for the difference between means, if n1 = 14 and n2 = 17, what is d.f. ? If the variances are equal. If the variances are not equal