A professor

A professor in a typing class found out that the average performance of an expert typist is 85 words per minute. A random sample of 16 students took the typing test, and we obtained an average speed of 62 words per minute with a standard deviation of 8. Can we say that the sample student's performance is below the standard deviation at the 0.05 level of significance?



Step-by-step explanation:

m=85 s=8  n2=16 m2=83.20  α=0.05  Z = N(0,1) z=s/n2m2m=8/1683.285=109=0.9  p = P(Z<z)  p=0.0559   α < p x=0

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