Question

How to solve problem 2?

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t tnng ltiöh för the next five problems. Independent random samples, consisting of 1-liter specimens of water, were obtained from two creeks near abandoned mines and the amount of zinc (in micrograms per liter) in cach specimen was measured. The resulting summary statistics are given below. Do the samples give enough evidence to conclude that there is a difference between the mean zinc levels of the two creeks? Sample Sample Mean Sample Variance Name (1)Jack Creek (2) Cataract Creek Size n1=15 n2=17 =993.1 s-650.25 點-968.6 s 1062.76 1. Which one of the following gives appropriate null and alternative hypotheses? [1 point] (a) Ho: 1 =R2 versus HA:え1ti2 (b) Ho:Ha-Ha versus Ha: μ1 > μ2 Ho:812 versus HA:32 2. Suppose that the population variance of the zinc level is the same for the two creeks. Calculate the おいpooled estimate of the common population variance. [1 point] 870.26 1.7(b) 980.03 Ze 21-56 4.23 (c) 1713.01 2 303 3. For this problem only, suppose that the pooled estimate of the common population variance had (d) 799696.40 25 S ,equaled 950. Calculate the test statistic. [1 point] 0.21 b)2.24 2.38 (d) 0.07 For this problem only, suppose that the test statistic had equaled 1.71. Find the p-value of the test.[1 point 4. 0.0436 10 p-value0.20 Which of the following conditions or assumptions does the above test of hypotheses rely on to be [1 point] (a) The population of zinc levels for each creek must be normally distributed. (b) The two population variances are unknown but equal to each other. c) The sam selected independently from each other. (d) All of the a

Answer 1