A consumer advocate agency wants to find the mean repair cost of a washing machine. As part of the study 40 repair costs were selected and the mean repair cost was determined to be $150.00. From past studies the agency assumes that o = $21. Construct a 95% confidence interval for the population mean. (Round confidence interval values to two decimal places.) and We are 95% confident that the mean repair cost is between

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A consumer advocate agency wants to find the mean repair cost of a washing machine. As part of the study 40 repair costs were selected and the mean repair cost was determined to be $150.00.
From past studies the agency assumes that o = $21. Construct a 95% confidence interval for the population mean.
(Round confidence interval values to two decimal places.)
and
We are 95% confident that the mean repair cost is between
Transcribed Image Text:A consumer advocate agency wants to find the mean repair cost of a washing machine. As part of the study 40 repair costs were selected and the mean repair cost was determined to be $150.00. From past studies the agency assumes that o = $21. Construct a 95% confidence interval for the population mean. (Round confidence interval values to two decimal places.) and We are 95% confident that the mean repair cost is between
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