SOLUTION: A research group states that 16% of the firms of type A increased their market research budgets in the past five year for type B firms , the figure was 9% What are the mean and sta

Question 1176130: A research group states that 16% of the firms of type A increased their market research budgets in the past five year for type B firms , the figure was 9% What are the mean and standard deviation of the sampling distribution of the difference between sample proportion, based on independent random samples of 100 firms of each type?
Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
The mean of the difference is 0.16-0.09=0.07
the SE is sqrt(0.125*0.875)(1/100+1/100)
This is 0.0468

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