Question

You may need to use the appropriate appendix table or technology to answer this question.

The following results are for independent random samples taken from two populations.

Sample 1 Sample 2

n1 = 20 n2 = 30

x1 = 22.8 x2 = 20.1

s1 = 2.2 s2 = 4.6

(a) What is the point estimate of the difference between the two population means? (Use x1 − x2. )

2.7

(b) What is the degrees of freedom for the t distribution? (Round your answer down to the nearest integer.)

(c) At 95% confidence, what is the margin of error? (Round your answer to one decimal place.)

(d) What is the 95% confidence interval for the difference between the two population means? (Use x1 − x2. Round your answers to one decimal place.)

Answer 1

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