This Test: 22 pts possi Assume that different groups of couples use a particular

Question

This Test: 22 pts possi 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 32 couples Complete parts (a) through (c) below Question Help a. Find the mean and the standard deviation for the numbers of girls in groups of 32 births The value of the mean is u 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 nule of thumb to find the values separating results that are sigificantly low or significantly hight 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 dec imal place as needed) c. Is the result of 30 girls a result that is significantly high? What does it suggest about the effectiveness of the method? The result significanly high, because 30 gits isaits A rest f gest tht ho metho girls. A result of 30 gris would suggest that the method Round to one decimal place as needed.) Enter your answer in each of the answer boxes. Section 8.1 Homework 10/28/17 11:59pm Section 8 2 10/28/17

Explanation / Answer

a) value of mean =np=32*0.5=16

std deviation =(np(1-p))1/2 =2.8

b)

as 2 std deviation away values are unusual;

values of 10 girls or fewer are significantly low

values of 22 girls or more are  significantly high

c)

the result is significantly high , because 30 girls is higher then 22 girl. A result of 30 girls .....the method is effective.

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