CONFIDENCE INTERVAL?
2015-12-01 7:10 am
The number of cars sold annually by used car salespeople is normally distributed with a standard deviation of 18. A random sample of 380 salespeople was taken and the mean number of cars sold annually was found to be 72. Find the 94 percent confidence interval estimate of the population mean.
回答 (1)
2015-12-01 8:29 am
✔ 最佳答案
A 94% confidence interval
= (72 - 1.88×18/√380 , 72 + 1.88×18/√380)
= (70.3 , 73.7)
收錄日期: 2021-05-02 21:23:19
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