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 50 couples. Complete parts​ (a) through​ (c) below.   a. Find the mean and the standard deviation for the numbers of girls in groups of 50 births.   The value of the mean is μ=_____________. ​(Type an integer or a decimal. Do not​ round.) The value of the standard deviation is 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 44 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 44 girls is less than,greater than equal to______________________ girls. A result of 44 girls would suggest that the method is not effective, is effective.

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

 

a. Find the mean and the standard deviation for the numbers of girls in groups of 50 births.
 
The value of the mean is μ=_____________.
​(Type an integer or a decimal. Do not​ round.)
The value of the standard deviation is 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 44 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 44 girls is less than,greater than
equal to______________________
girls. A result of 44 girls would suggest that the method is not effective,
is effective.
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