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 24 couples. Complete parts​ (a) through​ (c) below.       a. Find the mean and the standard deviation for the numbers of girls in groups of

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Author:Amos Gilat
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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
24
couples. Complete parts​ (a) through​ (c) below.
 
 
 
a. Find the mean and the standard deviation for the numbers of girls in groups of
24
births.
 
The value of the mean is
μ=nothing.
​(Type an integer or a decimal. Do not​ round.)
The value of the standard deviation is
σ=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
22
girls a result that is significantly​ high? What does it suggest about the effectiveness of the​ method?
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Follow-up 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
23
couples. Complete parts​ (a) through​ (c) below.
 
 
 

Question content area bottom

Part 1
a. Find the mean and the standard deviation for the numbers of girls in groups of
23
births.
 
The value of the mean is
μ=11.511.5.
​(Type an integer or a decimal. Do not​ round.)
Part 2
The value of the standard deviation is
σ=2.42.4.
​(Round to one decimal place as​ needed.)
Part 3
b. Use the range rule of thumb to find the values separating results that are significantly low or significantly high.
 
Values of
6.76.7
girls or fewer are significantly low.
​(Round to one decimal place as​ needed.)
Part 4
Values of
16.316.3
girls or greater are significantly high.
​(Round to one decimal place as​ needed.)
Part 5
c. Is the result of
19
girls a result that is significantly​ high? What does it suggest about the effectiveness of the​ method?
 
The result
is
 
significantly​ high, because
19
girls is
greater than
 
enter your response here
girls. A result of
19
girls would suggest that the method
 
 is not effective.
is effective.
​(Round to one decimal place as​ needed.)
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