waiting times for 64 randomly selected walk-in customers and determined that their mean waiting time was 15 minutes. Assume that the population standard deviation is 4 minutes. The 90% confidence interval for the population mean of waiting times is

1. 👍 0
2. 👎 0
3. 👁 89
1. 19

1. 👍 0
2. 👎 0
2. 15

1. 👍 0
2. 👎 0

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