Both the equal-variances and unequal variances test statistic and confidence interval estimator of
require that the two populations be normally distributed.
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Q1: The equal-variances test statistic of 
Q2: The sampling distribution of Q3: A political analyst in Iowa surveys a Q4: In testing the difference between two population 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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