Past experience indicates that the monthly long-distance telephone bill is normally distributed with a mean of 21.93 dollars and a standard deviation of 3.88 dollars. After an advertising campaign aimed at increasing long-distance telephone usage, a random sample of 25 household's bills was taken. The data (in dollars) is below. 15.65 31.01 22.6 15.13 20.04 23.06 31.04 27.37 20.54 24.42 26.85 22.52 29.12 26.87 28.1 17.01 16.95 18.41 24.48 21.83 29.27 23.34 25.59 25.94 22.31 Can we conclude at the 10% significance level that the campaign was successful? Fill in the requested information below. A. The value of the standardized test statistic: Note: For the next part, your answer should use interval notation. An answer of the form (-0, a) is expressed (- infty, a), an answer of the form (b, o0) is expressed (b, infty), and an answer of the form (-0, a) U (b, o0) is expressed (-infty, a)U(b, infty). B. The rejection region for the standardized test statistic: C. The p-value is D. Your decision for the hypothesis test:
Past experience indicates that the monthly long-distance telephone bill is normally distributed with a mean of 21.93 dollars and a standard deviation of 3.88 dollars. After an advertising campaign aimed at increasing long-distance telephone usage, a random sample of 25 household's bills was taken. The data (in dollars) is below. 15.65 31.01 22.6 15.13 20.04 23.06 31.04 27.37 20.54 24.42 26.85 22.52 29.12 26.87 28.1 17.01 16.95 18.41 24.48 21.83 29.27 23.34 25.59 25.94 22.31 Can we conclude at the 10% significance level that the campaign was successful? Fill in the requested information below. A. The value of the standardized test statistic: Note: For the next part, your answer should use interval notation. An answer of the form (-0, a) is expressed (- infty, a), an answer of the form (b, o0) is expressed (b, infty), and an answer of the form (-0, a) U (b, o0) is expressed (-infty, a)U(b, infty). B. The rejection region for the standardized test statistic: C. The p-value is D. Your decision for the hypothesis test:
A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
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Transcribed Image Text:Past experience indicates that the monthly long-distance telephone bill is normally distributed with a mean of 21.93
dollars and a standard deviation of 3.88 dollars. After an advertising campaign aimed at increasing long-distance
telephone usage, a random sample of 25 household's bills was taken. The data (in dollars) is below.
15.65 31.01
22.6
15.13 20.04 23.06 31.04
27.37 20.54
24.42
26.85
22.52 29.12 26.87
28.1
17.01
16.95
18.41
24.48 21.83 29.27
23.34 25.59 25.94 22.31
Can we conclude at the 10% significance level that the campaign was successful? Fill in the requested information
below.
A. The value of the standardized test statistic:
the next part, your answer should use interval notation. An answer of the form (-00, a) is expressed (-
infty, a), an answer of the form (b, oo) is expressed (b, infty), and an answer of the form (-00, a) U (b, o0) is
Note:
expressed (-infty, a)U(b, infty).
B. The rejection region for the standardized test statistic:
C. The p-value is
D. Your decision for the hypothesis test:
A. Reject H1.
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