There is an old folk belief that the sex of a baby can be guessed before birth

Question:

There is an old folk belief that the sex of a baby can be guessed before birth on the basis of its heart rate. In an investigation to test this theory, fetal heart rates were observed for mothers admitted to a maternity ward. The results (in beats per minute) are summarized in the table.

Construct a 95% confidence interval for the difference in population means. Does the confidence interval support the claim that the population mean sex difference (if any) in fetal heart rates is small and unimportant? (Use your own "expert" knowledge of heart rate to make a judgment of what is "unimportant.")