Introductory Statistics (10th Edition)
10th Edition
ISBN: 9780321989178
Author: Neil A. Weiss
Publisher: PEARSON
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Textbook Question
Chapter 8.2, Problem 32E
Refer to Procedure 8.1.
- a. Explain in detail the assumptions required for using the z-interval procedure.
- b. How important is the normality assumption? Explain your answer.
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(a) Verify that Ex = 477, Ey = 86.8, Ex? = 62,029, Ey2 = 2028.68, Exy = 11036.6, and r= 0.93853.
Ex
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(b) Use a 1% level of significance to test the claim p> 0. (Use 2 decimal places.)
critical t
Conclusion
Reject the null hypothesis, there is sufficient evidence that p > 0.
Reject the null hypothesis, there is insufficient evidence that p > 0.
O Fail to reject the null hypothesis, there is insufficient evidence that p > 0.
O…
Q22
Which of the following is not one of the uses of a scatter plot and regression line
a.
to estimate the average y at a specific value of x.
b.
All three are uses of the scatterplot and regression line
c.
to determine if a change in x causes a change in y
d.
to predict y at a specific value of x.
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