A gender-selection technique is designed to increase the likelihood that a baby will be a girl. In the results of the gender-selection technique,

853

births consisted of

428

baby girls and

425

baby boys. In analyzing these results, assume that boys and girls are equally likely.

a. Find the probability of getting exactly

428

girls in

853

births.

b. Find the probability of getting

428

or more girls in

853

births. If boys and girls are equally likely, is

428

girls in

853

births unusually high?

c. Which probability is relevant for trying to determine whether the technique is effective: the result from part (a) or the result from part (b)

?d. Based on the results, does it appear that the gender-selection technique is effective?