Which of the following is a required condition for using the normal approximation to the binomial in constructing interval estimate for the difference between two population proportions? 
Correct Answer:
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Q31: In testing whether the means of
Q32: In constructing a 95% interval estimate
Q33: When comparing two population variances, we
Q34: A random sample of 30 observations
Q35: In testing the hypotheses:
Q37: Two independent samples of sizes 35
Q38: Suppose that a one-tail t-test is
Q39: When the necessary conditions are met,
Q41: If a sample of size 28
Q69: If we reject a null hypothesis at
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