Question

(1 point) In order to compare the means of two populations, independent random samples of 271 observations are selected from each population, with the following results: Sample 1 Sample 2 1145 2 120 (a) Use a 99 % confidence interval to estimate the difference between the population means (A-μ). (b) Test the null hypothesis: HO : (μί-12-0 versus the alternative hypothesis. Ha : (μ-μ2)メ (i) the test statistic z () the positive critical z score (ii) the negative critical z score The final conclusion is O We can reject the null hypothesis al-μ2)-0 in favor ofthe alternative (μι-μ) 0 Using α-0.01, give the following: O There is not sufficient evidence to reject the null hypothesis (μ1-49)-0. (c) Test the null hypothesis: Ho : (μί-μ) = 22 versus the alternative hypothesis: Ha : (μι-μ2)メ22 Using a = 0.01 give the following: (i) the test statistic z = (i) the positive critical z score (ii) the negative critical z score The final conclusion is O We can reject the null hypothesis (μι-μ2)-22 in favor of the alternative (μ1-μ2) 22 O There is not sufficient evidence to reject the null hypothesis (14-12)-22.

Answer 1

Ans: Gen a 2. 120 s) (-31,179 2 le nel z-seove -2.se

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