The equal-variances test statistic of is Student t-distributed with n1 + n2 degrees of freedom, provided that the two populations are normal.
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Q2: The sampling distribution 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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