Fisher's least significant difference method (LSD)substitutes the pooled variance estimator from the equal variances t-test with the MSE from ANOVA.

Two independent samples of sizes 25 and 35 are randomly selected from two normal populations with equal variances. In order to test the difference between the population means, the test statistic is:

A) a standard normal random variable
B) approximately standard normal random variable
C) Student t-distributed with 58 degrees of freedom
D) Student t-distributed with 33 degrees of freedom
E) Student t-distributed with 18 degrees of freedom

Solve the equation. Do not use a calculator. $${\log }_6(2x+9)={\log }_6(4x+5)$$

A) $x=2$
B) $x=-7$
C) $x=7$
D) $x=-2$
E) no solution

Here is a histogram of leverages for this regression: Without doing any calculating,how would you expect the coefficient and t-statistic of English to change if we were to omit the 6 highest leverage points?

Plot the points on a rectangular coordinate system. $(2,4),(-2,-4)$

A)
B)
C)
D)
E)