Chapter 9: Q.18 (page 547)
Write a few sentences comparing what the P-values in Exercises 13 and 14 tell you about statistical significance in each of the two studies.
Short Answer
For P-value in exercisethe convincing evidence is stronger
Chapter 9: Q.18 (page 547)
Write a few sentences comparing what the P-values in Exercises 13 and 14 tell you about statistical significance in each of the two studies.
For P-value in exercisethe convincing evidence is stronger
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Are TV commercials louder than their surrounding programs? To find out, researchers collected data on randomly selected commercials in a given week. With the televisionโs volume at a fixed setting, they measured the maximum loudness of each commercial and the maximum loudness in the first seconds of regular programming that followed. Assuming conditions for inference are met, the most appropriate method for answering the question of interest is
(a) a one-proportion z test.
(b) a one-proportion z interval.
(c) a paired t test.
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You are testing against based on an SRS of observations from a Normal population. What values of the statistic are statistically significant at thelevel?
(a)
(b)
(c)
(d)
(c)
The z statistic for a test of H0 :p = 0.4 versus Ha : p > 0.4 is z = 2.43. This test is
(a) not significant at either or .
(b) significant at but not at
(c) significant at but not at .
(d) significant at both and .
(e) inconclusive because we donโt know the value of หp .
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