1. 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 interval for the population mean. (Round confidence interval values to two decimal places.) $21. Construct a 95% confidence Input decimal, keep 2 decimal places, for example: 0.12, don't input 12%. use z or t ? it equals E= Lower limit upper limit ( please show very detail work on your paper, graph, z score, t score, E ..etc...)

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1. 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 =
interval for the population mean. (Round confidence interval values to
two decimal places.)
$21. Construct a 95% confidence
Input decimal, keep 2 decimal places, for example: 0.12, don't input 12%.
use z or t
? it equals
E=
Lower limit
upper limit
( please show very detail work on
your paper, graph, z score, t score, E ....etc...)
Transcribed Image Text:1. 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 = interval for the population mean. (Round confidence interval values to two decimal places.) $21. Construct a 95% confidence Input decimal, keep 2 decimal places, for example: 0.12, don't input 12%. use z or t ? it equals E= Lower limit upper limit ( please show very detail work on your paper, graph, z score, t score, E ....etc...)
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