Question

# Assume that different groups of couples use a particular method of gender selection and each couple...

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 48 couples.Complete parts​ (a) through​ (c) below.

a. Find the mean and the standard deviation for the numbers of girls in groups of 48 births. The value of the mean is__ ​(Type an integer or a decimal. Do not​ round.) The value of the standard deviation is __. ​(Round to one decimal place as​ needed.)

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 as​ needed.) Values of ___ girls or greater are significantly high. (Round to one decimal place as​ needed.)

c. Is the result of 42 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 42 girls is greater than/equal to/less than ___ girls. A result of 42 girls would suggest that the method is not effective/is effective.​(Round to one decimal place as​ needed.)

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