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(a) What is the sampling distribution for the difference in two sample means? What are the conditions for the sampling distribution of the difference of

(a) What is the sampling distribution for the difference in two sample means? What are the conditions for the sampling distribution of the difference of two sample means to be approximately normal? What are the mean and standard deviation of the sampling distribution of the difference of two sample means?

(b) What is the sampling distribution for the difference in two sample proportions? What are the conditions for the sampling distribution of the difference of two sample proportions to be approximately normal? What are the mean and standard deviation of the sampling distribution of the difference of two sample proportions?

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