MATLAB: An Introduction with Applications
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The manufacturer of a sports car claims that the fuel injection system lasts 48 months before it needs to be replaced. A consumer group tests this claim by surveying a random sample of 10 owners who had the fuel injection system replaced. The ages of the cars at the time of replacement were (in months):
| 23 | 44 | 47 | 48 | 53 | 46 | 30 | 51 | 42 | 52 |
(i) Use your calculator to calculate the mean age of a car when the fuel injection system fails x and standard deviation s. (Round your answers to two decimal places.)
| x = | months |
| s = |
months |
(a) What is the level of significance?
What is the value of the sample test statistic? (Round your answer to three decimal places.)
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