Gender Selection At an early stage of clinical trials of the XSORT method of gender selection, 14 couples using that method gave birth to 13 girls and 1 boy.

a. Assuming that the XSORT method has no effect and boys and girls are equally likely, use the range rule of thumb to identify the limits separating values that are significantly low and those that are significantly high (for the number of girls in 14 births). Based on the results, is the result of 13 girls significantly high?

b. Find the probability of exactly 13 girls in 14 births, assuming that the XSORT method has no effect.

c. Find the probability of 13 or more girls in 14 births, assuming that the XSORT method has no effect.

d. Which probability is relevant for determining whether 13 girls is significantly high: the probability from part

(b) or part (c)? Based on the relevant probability, is the result of 13 girls significantly high?

e. What do the results suggest about the effectiveness of the XSORT method?