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 a girl, but assume that the method has no effect, so the probability of a girl is 0.5. Assume that the groups consist of 43 couples. Complete parts (a) through (c) below.

a. Find the mean and the standard deviation for the numbers of girls in groups of 43 births.

The value of the mean is__ .

The value of the standard deviation is __. 

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. 

Values of ___ girls or greater are significantly high. 

c. Is the result of 32 girls a result that is significantly high? What does it suggest about the effectiveness of the method?

The result is/is not significantly high, because 32 girls is greater than/equal to/less than ___ girls. A result of 32 girls would suggest that the method is not effective/is effective.