## Testing the Difference Between Two Means: Using the z-Test

III. Testing the Difference Between Two Means: Using the z-Test

1. Home prices in two different locations are shown below. At α=0.01 is there enough evidence to reject the claim that the average cost in both locations is the same?
 Location A Location B = \$93,430 = \$98,043 = \$5,602 = \$4,731 = 35 = 40
1. National and local ACT scores are shown below. At α=0.05, can we conclude that the local scores are below the national average?
 National ACT score ACT score = 21.4 = 20.8 = 3.0 = 3.0 = 1,000 = 500

Week 6 Homework Assignments

1. This week we must read:

Lane et al. Chapters 11, 12, & 13

Textbook #1: Lane et al. Introduction to Statistics, David M. Lane et al., 2013.

( http://onlinestatbook.com/Online_Statistics_Education.pdf )
Illowsky et al. Chapters 9 & 10

Textbook #2: Illowsky et al. Introductory Statistics, Barbara Illowsky et al., 2013.( http://openstaxcollege.org/files/textbook_version/hi_res_pdf/15/col11562-op.pdf )

1.  Do the five problems listed in the table below.