Question: Mobile Device Repair Costs research a) In a random sample of 12 mobile devices, the mean repair cost was $90.42 and the standard deviation was

Mobile Device Repair Costs research

a) In a random sample of 12 mobile devices, the mean repair cost was $90.42 and the standard deviation was $33.61.

b) You research repair costs of mobile devices and find that the population mean is $89.56. In a), does the t-value fall between -t95 and t0.95?

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