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5.)Long-term experience shows that after laser eye surgery, the mean recovery time is = 5.3 days....

5.)Long-term experience shows that after laser eye surgery, the mean recovery time is = 5.3 days. However, a random sample of 32 patients with this surgery had a sample mean recovery time of = 4.2 days. Does this indicate that the mean recovery time is dropping? Use a 1% level of significance. Assume = 1.9 days. Interpret your answer.
Math   Statistics-And-Probability   
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