The Department of Economic and Community Development (DECD) reported that in 2009 the average number of new jobs created per county was 450. The department
The Department of Economic and Community Development (DECD) reported that in 2009 the average number of new jobs created per county was 450. The department also provided the following information regarding a sample of 5 counties in 2010.
County | New Jobs Created In 2010 |
Bradley | 410 |
Rhea | 480 |
Marion | 407 |
Grundy | 428 |
Sequatchie | 400 |
a. | Compute the sample average and the standard deviation for 2010. |
b. | We want to determine whether there has been a significant decrease in the average number of jobs created. Provide the null and the alternative hypotheses. |
c. | Compute the test statistic. |
d. | Compute the p-value; and at 95% confidence, test the hypotheses. Assume the population is normally distributed. |
Step by Step Solution
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Step: 1
New Jobs Created In 2010 410 480 407 428 400 1 410 480 400 2125 Sample Mean 425 5 n Mean 425 x 72 40...
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Authors: Paul Newbold, William Carlson, Betty Thorne
8th Edition
0132745658, 978-0132745659
