The duration (in minutes) for a sample of 20 flight-reservation telephone calls is shown in the following table: 2.1 10.4 4.8 5.5 5.9 10.5 4.5 4.8 3.3 5.8 2.8 6.6 7.5 4.8 5.5 3.5 5.3 3.6 7.8 6.0 NOTE: Ex=111 and x = 709.82

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The duration (in minutes) for a sample of 20 flight-reservation telephone calls is shown in the following
table:
2.1
10.4
4.8
5.5
4.5
2.8
5.9
10.5
4.8
3.3
5.8
6.6
7.5
4.8
5.5
3.5
5.3
3.6
7.8
6.0
NOTE: Ex=111 and x = 709.82
Assuming the population has a normal distribution, find a 95% confidence interval for the population
mean time.
Transcribed Image Text:The duration (in minutes) for a sample of 20 flight-reservation telephone calls is shown in the following table: 2.1 10.4 4.8 5.5 4.5 2.8 5.9 10.5 4.8 3.3 5.8 6.6 7.5 4.8 5.5 3.5 5.3 3.6 7.8 6.0 NOTE: Ex=111 and x = 709.82 Assuming the population has a normal distribution, find a 95% confidence interval for the population mean time.
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