Consider the following results for independent random samples taken from two populations. Sample 1 n1 = 10 x1 = 22.5 s1 = 2.9 Sample 2 n2 = 30 x2 = 20.7 s2 = 4.3 a. What is the point estimate of the difference between the two population means (to 1 decimal)? 1.8 b. What is the degrees of freedom for the t distribution (round the answer to the previous whole number)? c. At 95% confidence, what is the margin of error (to 1 decimal)? d. What is the 95% confidence interval for the difference between the two population means (to 1 decimal and enter negative value as negative number)?
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We need to find the point estimate of the difference between the two population means. The point estimate is the difference between the sample means. Sample 1 mean (M1) = 62 Sample 2 mean (M2) = 71 Point estimate = M1 - M2 = 62 - 71 = -9 So, the point estimate Show more…
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