Determine whether the results appear to have statistical significance, and also determine whether the results appear to have practical significance. In a study of a gender selection method used to increase the likelihood of a baby being born a girl, 2031 users of the method gave birth to 994 boys and 1037 girls. There is about anan 18% chance of getting that many girls if the method had no effect.

_________ couples would likely use a procedure that raises the likelihood of a girl from the approximately 50% rate expected by chance to the ____% produced by this method.

(Round to the nearest integer as needed.)

So this method _____________ "

Solution to the problem

First we can find the proportion of grils and boys in the sample

[tex] P_{boys}= \frac{994}{2031}=0.489[/tex]

[tex] P_{girls}=\frac{1037}{2031}=0.511[/tex]

For the first blank space we have this:

Because there is a 18% chance of getting that many girls by chance, the method does not have statistical significance. (The reason is because we need to have >50% in order to have statistical significance in order to increase the likehoog of a baby being born as girl, since from theory the original probability that a baby would be girl is 0.5 or 50%)

For the next paragraph we have:

Not many couples would likely use a procedure that raises the likelihood of a girl from the approximately 50% rate expected by chance to the 51% produced by this method.

And for the last paragraph we have this:

So this method does not have practical significance (Because not increase as the expected results the probability that a baby would be girl)