Chapter 9

Question 1

Dependent

Answer 1

a test using the t-statistic that establishes whether two means collected from the same sample (or related observations) differ significantly.

Question 2

Grand mean

Answer 2

the mean of an entire set of observations.

Question 3

Independent

Answer 3

a test using the t-statistic that establishes whether two means collected from independent samples differ significantly.

Question 4

Standard error of differences

Answer 4

if we were to take several pairs of samples from a population and calculate their means, then we could also calculate the difference between their means. If we plotted these differences between sample means as a frequency distribution, we would have the sampling distribution of differences. The standard deviation of this sampling distribution is the standard error of

Question 5

Variance sum law

Answer 5

states that the variance of a difference between two independent variables is equal to the sum of their variances.