Question: Test the given claim. Identify the null hypothesis, alternative hypothesis, test statistic, P-value or critical values(s), conclusion about the null hypothesis, and final conclusion that addresses the original claim. Use the P-value method.

A random sample of 100 babies is obtained, and the mean head circumference is found to be 40.6cm. Assuming that the population standard deviation is know to be 1.6cm, use a 0.05 significance level to test the claim that the mean head circumference of all 2-month old babies is equal to 40.0cm.