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In a recent year, the mean weight of newborn boys in a certain country was 6.3 pounds. A doctor wants to know whether the mean weight of newborn girls differs from this. State the appropriate null and alternate hypotheses.

Step 1 ：The question is asking for the null and alternate hypotheses for a statistical test. The null hypothesis is typically a statement of no effect or no difference. In this case, the null hypothesis would be that the mean weight of newborn girls is the same as the mean weight of newborn boys, which is 6.3 pounds.

Step 2 ：The alternate hypothesis is what we are testing for. In this case, the alternate hypothesis would be that the mean weight of newborn girls is not the same as 6.3 pounds.

Step 3 ：Final Answer: The null hypothesis is that the mean weight of newborn girls is 6.3 pounds. The alternate hypothesis is that the mean weight of newborn girls is not 6.3 pounds.