In testing the difference between two population means using two independent samples,the sampling distribution of the sample mean difference is normal if the sample sizes are both greater than 30.
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Q10: The expected value of the difference of
Q12: The expected value of Q13: Unless we can conclude that the population Q14: The variance of Q16: Two independent samples of sizes 20 and Q17: In testing the difference between the means Q18: When the population variances are unequal,we estimate Q19: Both the equal-variances and unequal variances test Q20: When the sample sizes are equal,the pooled Q77: Independent samples are those for which the
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