According to the 2016 Consumer Expenditure Survey, Americans spend an average of $1,124 on cellular phone service annually.† Suppose that we wish to determine if there are differences in cellular phone expenditures by age group. Therefore, samples of 10 consumers were selected for three age groups (18–34, 35–44, 45 and older). The annual expenditure for each person in the sample is provided in the table below. 18–34 35–44 45 and Older 1,355 969 1,135 115 434 956 1,456 1,792 400 2,045 1,500 1,374 1,621 1,277 1,244 994 1,056 825 1,937 1,922 763 1,200 1,350 1,192 1,567 1,586 1,305 1,390 1,415 1,510
According to the 2016 Consumer Expenditure Survey, Americans spend an average of $1,124 on cellular phone service annually.† Suppose that we wish to determine if there are differences in cellular phone expenditures by age group. Therefore, samples of 10 consumers were selected for three age groups (18–34, 35–44, 45 and older). The annual expenditure for each person in the sample is provided in the table below. 18–34 35–44 45 and Older 1,355 969 1,135 115 434 956 1,456 1,792 400 2,045 1,500 1,374 1,621 1,277 1,244 994 1,056 825 1,937 1,922 763 1,200 1,350 1,192 1,567 1,586 1,305 1,390 1,415 1,510
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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According to the 2016 Consumer Expenditure Survey, Americans spend an average of $1,124 on cellular phone service annually.† Suppose that we wish to determine if there are differences in cellular phone expenditures by age group. Therefore, samples of 10 consumers were selected for three age groups (18–34, 35–44, 45 and older). The annual expenditure for each person in the sample is provided in the table below.
| 18–34 | 35–44 | 45 and Older |
|---|---|---|
| 1,355 | 969 | 1,135 |
| 115 | 434 | 956 |
| 1,456 | 1,792 | 400 |
| 2,045 | 1,500 | 1,374 |
| 1,621 | 1,277 | 1,244 |
| 994 | 1,056 | 825 |
| 1,937 | 1,922 | 763 |
| 1,200 | 1,350 | 1,192 |
| 1,567 | 1,586 | 1,305 |
| 1,390 | 1,415 | 1,510 |
(a)
Compute the mean, variance, and standard deviation for each of the three samples. (Round your answers to two decimal places.)
| 18–34 | 35–44 | 45+ | |
|---|---|---|---|
| mean | $ | $ | $ |
| variance | |||
| standard deviation | $ | $ | $ |
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