Chapter 10 Comparing Two Means

Question 1

Dependent t-test (1)

Answer 1

1. Paired-samples t-test

Question 2

Dummy Variables (3)

Answer 2

1. A way of recoding a categorial variables with more than two categories
2. Into a series of variables all of which are dichotomous
3. And can take on values of only 0 or 1.

Question 3

Grand Mean (1)

Answer 3

1. The mean of an entire set of observations

Question 4

Independent t-test (2)

Answer 4

1. A test using the t-statistic

2. That establishes whether two means collected from independent samples differ significantly

Question 5

Paired-samples t-test (2)

Answer 5

1. A test using the t-statistic

2. That establishes whether two means collected from the same sample differ significantly

Question 6

Standard Error of Differences (7)

Answer 6

1. If we were to take several pairs of samples from a population
2. and calculated their means,
3. then we could also calculate the difference between their means.
4. If we plotted these differences between sample means as a frequency distribution,
5. we would have the sampling distribution of differences.
6. The standard deviation of this sampling distribution is the standard error of differences.
7. As such it is a measure of the variability of differences between sample means.

Question 7

Variance Sum Law (2)

Answer 7

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