Assume that different groups of couples use a particular method of gender selection and each couple gives birth to one baby. This method is designed to increase the likelihood that each baby will be agirl, but assume that the method has noeffect, so the probability of a girl is 0.5. Assume that the groups consist of 38 couples. Complete parts(a) through(c) below.

a)Find the mean and the standard deviation for the numbers of girls in groups of 38 births.

The value of the mean is =

.

(integer or a decimal. Do notround.)

The value of the standard deviation is =

.

(Round to one decimal place asneeded.)

b. Use the range rule of thumb to find the values separating results that are significantly low or significantly high.

Values of ______girls or fewer are significantly low.

(Round to one decimal place asneeded.)

Values of ______ girls or greater are significantly high.

(Round to one decimal place asneeded.)

c. Is the result of 33 girls a result that is significantlyhigh? What does it suggest about the effectiveness of themethod?

The result (is? is not?) significantlyhigh, because 33 girls is (less than? equal to? greater than?) _____girls.

A result of 33 girls would suggest that the method (is not effective? is effective?)