SOLUTION: A sample of 111 Vopstra customers have had their annual phone charge recorded for the previous calendar year. The data were used to calculate a 93% confidence interval for the mean
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-> SOLUTION: A sample of 111 Vopstra customers have had their annual phone charge recorded for the previous calendar year. The data were used to calculate a 93% confidence interval for the mean
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Question 227767: A sample of 111 Vopstra customers have had their annual phone charge recorded for the previous calendar year. The data were used to calculate a 93% confidence interval for the mean annual phone charge of all Vopstra customers. The confidence interval was calculated as $445 ± $75. According to this confidence interval, it is most reasonable to conclude that:
1.)you are 93% confident the mean phone charge of all mobile phone customers is approximately $445
2.)you are 93% confident the interval between $370 and $520 contains the mean phone charge of all Vopstra customers
3.)you are 93% confident the mean phone charge of all Vopstra customers is approximately $445
4.)you are 93% confident the interval between $370 and $520 contains the mean phone charge of all mobile phone customers
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