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Question 1

Assumptions of two-proportion Z-test? 3•

Answer 1

•two populations have been predetermined
•Each population can be partitioned into two mutually exclusive and exhaustive subsets labeled successes and failures with unknown proportions of success
•independent random samples with expected number of samples at least 10

Question 2

Assumptions for two mean t-test? 3•

Answer 2

•Two populations have been predetermined
•Each population’s distribution is normally distributed or not extremely skewed with unknown means ad variances respectively.
•independent random sample sizes where min is large enough for central limit theorem.