Question

Chapter 6, Section 4-CI, Exercise 191

Use the t-distribution to find a confidence interval for a difference in means μ1- μ 2 given the relevant sample results. Give the best estimate for μ1- μ 2, the margin of error, and the confidence interval. Assume the results come from random samples from populations that are approximately normally distributed.

A 90% confidence interval for μ1- μ 2 using the sample results X̄1=5.4 ,s1=3.0, n1 = 11.

And X̄2=4.3 ,s2= 3.1, n2= 8

Enter the exact answer for the best estimate and round your answers for the margin of error and the confidence interval to two decimal places.

Best estimate

Margin of error

Confidence interval :              to

Answer 1