Midterm 2

Question 1

Assumptions of paired t-test (2)

Answer 1

Pairs are a random sample from the population

Paired differences are normally distributed

Question 2

The test statistic for 2 sample test

Answer 2

t = Y1 - Y2 / SEY1-Y2

Question 3

SEY1-Y2

Answer 3

[Sp^2 * (1/n1 +1/n2)]^1/2

Question 4

Sp^2

Answer 4

(df1s1^2 + df2s2^2) / (df1 +df2)

Question 5

Assumptions of two-sample t-test (3)

Answer 5

Both samples are random samples from a population
Variable is normally distributed
The standard deviation of 2 groups is ~ equal

If not equal use Welch’s test