Question

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

a. Find the mean and the standard deviation for the numbers of girls in groups of 45 births.

The value of the mean is

mu

μ= _________.

​(Type an integer or a decimal. Do not​ round.)

The value of the standard deviation is sigma

σ = ________.

​(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 38 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 38 girls is ________ (greater than / equal to / less than) ______ girls. A result of 38 girls would suggest that the method __________ (is effective/ is not effective)

​(Round to one decimal place as​ needed.)

(THIS IS ALL INFORMATION PROVIDED TO ME)

Answer 1