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

0.50.5.

Assume that the groups consist of

2929

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

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

2929

births.The value of the mean is

muμequals=nothing.

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

The value of the standard deviation is

sigmaσequals=nothing.

​(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

nothing

girls or fewer are significantly low.

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

Values of

nothing

girls or greater are significantly high.

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

c. Is the result of

2222

girls a result that is significantly​ high? What does it suggest about the effectiveness of the​ method?The result

▼

is not

is

significantly​ high, because

2222

girls is

▼

greater than

less than

equal to

nothing

girls. A result of

2222

girls would suggest that the method

▼

is not effective.

is effective.

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

Answer 1