Chapter 11 Independent Samples t Test

Question 1

Conceptual understanding of independent samples t Test and when to use them

Answer 1

A test used to compare the means of two groups when the scores between the groups are independent of one another (e.g., often when we have a between-subjects design)

Question 2

Calculation of the independent samples t statistic

Answer 2

t= ( (Mx-My) - (μx-μy) )/ Sdifference

Question 3

Assumptions

Answer 3

1. the dependent variable is measured as a scale variable
2. participants are randomly selected
3. the population of interest is normally distributed
4. the independent variable is nominal
5. we have independent samples (uncorrelated groups)
6. we assume homogeneity of variance

Question 4

Homogeneity of variance

Answer 4

variances of our populations are the same

Question 5

Steps for hypothesis testing

Answer 5

1. identify the populations, distribution, and assumptions. Then choose the appropriate test
2. State the null and alternative hypotheses in words and symbolic notation
3. Determine the characteristics of the comparison distribution. This will be the. distribution of differences between means
4. Determine critical values
5. Calculate test statistic
6. Decide to reject or fail to reject the null hypothesis