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Question
The manager of Hudson Auto Repair wants to advertise one price for an engine tune-up, with parts included. Before he decides the price to advertise, he needs a good estimate of the average cost of tune-up parts. A sample of 20 customer invoices for tune-ups has been taken and the costs of parts, rounded to the nearest dollar, are listed below.| 91 | 78 | 93 | 57 | 75 | 52 | 99 | 80 | 105 | 62 |
| 104 | 74 | 62 | 68 | 97 | 73 | 77 | 65 | 80 | 109 |
Provide a 90% confidence interval estimate of the mean cost of parts per tune-up for all of the tune-ups performed at Hudson Auto Repair.
Answer
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