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A researcher thinks that if knee surgery patients go to physical therapy for 40 patients (on...

A researcher thinks that if knee surgery patients go to physical therapy for 40 patients (on average) 5 times a week (no less than 2 or higher than 8), their recovery period will be longer, the sample standard division is 0.01. Is there sufficient evidence to reject the researcher claim α = 0.05.

using test of hypothesis

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