Part 1 of 5
A self-serving coffee-dispensing machine at a gas station convenience store is supposed to deliver 8 oz when a small drink is ordered. A quality control engineer claims that the mean serving of a coffee-dispensing machine is different from 8 oz per serving. A simple random sample of 26 servings shows the following data:
| 7.8 | 7.3 | 7.4 | 7.7 | 8.3 |
| 8.3 | 8.1 | 7.9 | 7.7 | 7.9 |
| 6.6 | 7.4 | 7.9 | 7.9 | 8.4 |
| 8.5 | 8.3 | 8.7 | 8 | 8.8 |
| 8.7 | 8.2 | 7.6 | 8.1 | 8.1 |
| 7.8 |
At the 10% significance level, test the quality control engineer's claim assuming that the population standard deviation of servings is 0.45 oz. You may also assume that the sample is from a normal population. (Note: The average and the standard deviation of the data are respectively 7.98 oz and 0.49 oz.)
Procedure:
Assumptions: (select everything that applies)
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