Use the Following Information for Questions

Use the following information for questions:
At a small college somewhere on the East coast, 20% of the girls and 30% of the boys smoke at least once a week. Independent random samples of 75 girls and 100 boys are to be selected and the proportions of smokers in the samples are to be calculated.
-What is the standard deviation of the sampling distribution of the difference in the sample proportion of girl smokers and the sample proportion of boy smokers?

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