   # The following results are for independent random samples taken from two populations. a. What is the point estimate of the difference between the two population means? b. What is the degrees of freedom for the t distribution? c. At 95% confidence, what is the margin of error? d. What is the 95% confidence interval for the difference between the two population means? ### Essentials Of Statistics For Busin...

9th Edition
David R. Anderson + 4 others
Publisher: South-Western College Pub
ISBN: 9780357045435

#### Solutions

Chapter
Section ### Essentials Of Statistics For Busin...

9th Edition
David R. Anderson + 4 others
Publisher: South-Western College Pub
ISBN: 9780357045435
Chapter 10.2, Problem 9E
Textbook Problem
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## The following results are for independent random samples taken from two populations. a. What is the point estimate of the difference between the two population means? b. What is the degrees of freedom for the t distribution? c. At 95% confidence, what is the margin of error? d. What is the 95% confidence interval for the difference between the two population means?

a.

To determine

Find the point estimate of the difference between the two population means.

### Explanation of Solution

Calculation:

The results of two independent random samples drawn from two populations are as follows:

 Sample 1 Sample 2 n1=20 n2=30 x¯1=22.5 x¯2=20.1 s1=2.5 s2=4

b.

To determine

Find the degrees of freedom for the t distribution.

c.

To determine

Find the margin of error at 95% confidence.

d.

To determine

Find the 95% confidence interval for the difference between the two population means.

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