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A random sample of 100 two-month old babies is obtained, and the mean head circumference is...

A random sample of 100 two-month old babies is obtained, and the mean head circumference is found to be 40.6 cm. Assume that the population standard deviation is known to be 1.6cm. We will test the claim that the mean head circumference of all two-month old babies is equal to 40.0cm. Use a=0.05.

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