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A medical investigation claims that the average number of infections per week at a hospital in Pennsylvania is not 19.1. A random sample of 32

A medical investigation claims that the average number of infections per week at a hospital in Pennsylvania is not 19.1. A random sample of 32 weeks had a mean number of 17.7 infections, and a sample standard deviation is 3.8. Is there enough evidence to support the investigator's claim? Use a 10% level of significance to test this claim.

(Test the claim using critical value method)

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