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.
  2.  Please submit them in your Assignment Folder for grading.
 eResources Chapter Problem Page*  
 Lane et al.  11  18  397 Type I, II errors
 12   3  441 Two Independent Samples
 Illowsky et al.   9

 

 65  508 Hypotheses, T/F
 77  510 Hypotheses, t-test
 10  80  561 Matched Pairs

 

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