The sampling distribution of 
is normal if the sampled populations are normal, and approximately normal if the populations are nonnormal and the sample sizes n1 and n2 are large.
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Q1: The equal-variances test statistic of 
Q3: A political analyst in Iowa surveys a
Q4: In testing the difference between two population
Q5: Both the equal-variances and unequal variances test
Q7: The best estimator of the difference between
Q10: The expected value of the difference of
Q13: Unless we can conclude that the population
Q18: In testing the difference between the means
Q20: When the sample sizes are equal,the pooled
Q149: When we test for differences between the
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