How well do airline companies serve their customers? A study showed the followin
ID: 3127419 • Letter: H
Question
How well do airline companies serve their customers? A study showed the following customer ratings: 3% excellent, 28% good, 45% fair, and 24% poor. In a follow-up study of service by telephone companies, assume that a sample of 400 adults found the following customer ratings: 24 excellent, 124 good, 172 fair, and 80 poor. Is the distribution of the customer ratings for telephone companies different from the distribution of customer ratings for airline companies? Calculate the appropriate test statistic
Select one:
A. 12.3556
B. 11.345
C. 10.7334
D. 16.3079
How well do airline companies serve their customers? A study showed the following customer ratings: 3% excellent, 28% good, 45% fair, and 24% poor. In a follow-up study of service by telephone companies, assume that a sample of 400 adults found the following customer ratings: 24 excellent, 124 good, 172 fair, and 80 poor. Is the distribution of the customer ratings for telephone companies different from the distribution of customer ratings for airline companies? Assume alpha is 1%. Define the critical test statistic and specify your conclusion.
Select one:
Explanation / Answer
How well do airline companies serve their customers? A study showed the following customer ratings: 3% excellent, 28% good, 45% fair, and 24% poor. In a follow-up study of service by telephone companies, assume that a sample of 400 adults found the following customer ratings: 24 excellent, 124 good, 172 fair, and 80 poor. Is the distribution of the customer ratings for telephone companies different from the distribution of customer ratings for airline companies? Calculate the appropriate test statistic
Select one:
A. 12.3556
B. 11.345
C. 10.7334
D. 16.3079
Answer D: 16.3079
Goodness of Fit Test
observed
expected
O - E
(O - E)² / E
24
12.000
12.000
12.0000
124
112.000
12.000
1.2857
172
180.000
-8.000
0.3556
80
96.000
-16.000
2.6667
400
400.000
16.3079
How well do airline companies serve their customers? A study showed the following customer ratings: 3% excellent, 28% good, 45% fair, and 24% poor. In a follow-up study of service by telephone companies, assume that a sample of 400 adults found the following customer ratings: 24 excellent, 124 good, 172 fair, and 80 poor. Is the distribution of the customer ratings for telephone companies different from the distribution of customer ratings for airline companies? Assume alpha is 1%. Define the critical test statistic and specify your conclusion.
Select one:
A. 2=11.345. Failed to reject the null hypothesis. The distribution rating for telephone companies is not significantly different that airline companies.
B. 2=11.345. Reject the null hypothesis. The distribution rating for telephone companies is significantly different that airline companies.
C. 2=11.345. Failed to reject the null hypothesis. The distribution rating for telephone companies is significantly different that airline companies.
D. 2=11.345. Reject the null hypothesis. The distribution rating for telephone companies is not significantly different that airline companies.
Calculate value 16.3079 > 11.345, the table value. The null hypothesis is rejected.
Goodness of Fit Test
observed
expected
O - E
(O - E)² / E
24
12.000
12.000
12.0000
124
112.000
12.000
1.2857
172
180.000
-8.000
0.3556
80
96.000
-16.000
2.6667
400
400.000
16.3079
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