IP Take a Test Gabrielle Bur x CH 6: C e I Chegg.c C https:// www.mathxl.com /St

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IP Take a Test Gabrielle Bur x CH 6: C e I Chegg.c C https:// www.mathxl.com /Student/PlayerTe aspx EE Apps UF University of Florida D UF Registrar UF University of Florida... UF www.honors.ufl.edu D myUFL University of Florida... D STARS -College por.. Agenda C l Ev... UF University of Florida:.. High School Codes i MyMathLab Gabrielle Burch 2/28/16 8:54 AM Quiz: Chapter 12 Review Quiz Submit Quiz This Question: 1 pt 2 of 10 (0 complete This Quiz: 10 pts possible Has the ease of removing your name from an e-mail list changed? A study of 100 large online retailers revealed the following data. Complete parts (a) through (c) below. Needs Three or More Clicks To Be Removed Year 2009 32 68 2008 93 Click the icon to view the critical values of x table. What is the critical value? (Round to three decimal places as needed.) Is this value significant at 0.05? Yl, because the test statistic is Y the critical value. The null hypothesis should c. Another statistician tested the same data to try to determine whether it takes more effort to be removed from an e-mail list than it used to. They used a Z test for the difference between two proportions. Their test statistic was 8.924 and their critical value was 1.645 Why shouldn't you compare your results to theirs? Choose the best explanation below O A. The Z test does not take degrees of freedom into account, while the X test does O B. The Z test approximately follows the standard normal distribution, while the x2 st approximately follows the X distribution O C. Their test was a one-tail test because their hypotheses were different from yours. O D. Their test may have resulted in a positive test statistic in this case, but Z tests can produce negative test statistics, while X tests cannot. Click to select your answer(s) 9:54 AM 2/28/2016

Explanation / Answer

chi square =19.90076

p value = 0.000001

Since p <0.05 reject null hypothesis.

Yes, chi square value is significant.

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Option D is right.

Results yes no Row Totals 2009 32  (19.50)  [8.01] 68  (80.50)  [1.94] 100 2008 7  (19.50)  [8.01] 93  (80.50)  [1.94] 100 Column Totals 39 161 200  (Grand Total)

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