* A survey of the white and nonwhlte population In a local area reveals the following annual trip frequencies to the nearest state park: = 4.1, I = 3.1, si = 14.3, s= 12.0, n, = 20 n2 = 16 where the subscript '1' denotes the white population and the subscript '2' denotes the nonwhite population. a. Assume that the variances are equal, and test the null hypothesis that there is no difference between the park-going frequencies of whites and nonwhites. b. Repeat the exercise, assuming that the variances are unequal. C. Find the p-value associated with the tests in parts (a) and d. Associated with the test in part (a), find a 95% confidence interval for the difference in means

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