In testing the difference between the means of two normallydistributed populations, if μ1 =μ2 = 50, n1 = 9, andn2 = 13, the degrees of freedom for thet statistic equals ___________.
19,20,21,22
When comparing two independent population means by using samplesselected from two independent, normally distributed populationswith equal variances, the correct test statistic to use is______.
z,F,t, t^2
When testing a hypothesis about the mean of a population ofpaired differences in which two different observations are taken onthe same units, the correct test statistic to use is _________.
z, None of the other choices is correct, t,F, chi-square
In testing the difference between the means of two normallydistributed populations using independent random samples, thecorrect test statistic to use is the
F statistic, chi-square statistic, None of the otherchoices is correct, t statistic, z statistic.
In general, the shape of the F distribution is_________.
skewed right, skewed left, binomial, normal
