Question:

Researchers studying infant head circumferences (in centimeters) wish to test if the mean head circumference differs from the historical mean of 34.5 cm. The researchers obtain a sample of 17 infants with a mean head circumference of 34.16 cm and a standard deviation of 0.58 cm.

At the  = 0.05 significance level, test the claim

H _O :  = 34.5

H _A :  ≠ 34.5

1. Is this an upper tail , lower tail , or two-tail test? (4 points)
2. Are we testing means or proportions? (4 points)
3. State the rule of rejection (in terms of p-value and level of significance) (4 points)
4. Find the p-value (4 points)
5. Should you reject or not reject H _O ? (4 points)
6. Does the result suggest that the mean head circumference differs from 34.5 cm? (4 points)

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Solution: The downloadable solution consists of 2 pages
Deliverable: Word Document