Exam 7: Introduction to T Tests: Single Sample and Dependent Means

If the results of a study are reported in a research article as "t (29)= 2.31,p < .05," you can conclude that the result is __________.

Professor Q has designed a repeated measures experiment.Which information does he NOT need when looking up the power of his planned study in a power table?

If a sample includes three individuals with scores of 4,6,and 8,the estimated population variance is

A counseling psychologist developing a technique to reduce procrastination has students time their procrastination for a week and uses this as a pretest measure of procrastination. Students then attend a workshop in which they are instructed to do a specific warm-up exercise for studying by focusing on a pleasant activity. Students again time their procrastination for a week, and the time from this second week is the posttest measure. -If the psychologist wants to see if there is a change (increase or decrease)in procrastination by students who attended his workshop,the appropriate description of "Population 2" (the comparison population)would be people whose

Studies using difference scores tend to have larger effect sizes than studies using other research designs because

When the results of a t test are presented in a research article,the number(s)in parentheses that directly follow the t score is(are)the __________.

In the formula for effect size,d is for the difference between the means of the __________ divided by the variance.

Given a particular number of degrees of freedom,there is(are)__________ t distribution(s).

A counseling psychologist developing a technique to reduce procrastination has students time their procrastination for a week and uses this as a pretest measure of procrastination. Students then attend a workshop in which they are instructed to do a specific warm-up exercise for studying by focusing on a pleasant activity. Students again time their procrastination for a week, and the time from this second week is the posttest measure. -If the psychologist finds that the sum of squared deviations from the mean of the difference scores of the sample is 135,the estimated population variance would be

A school psychologist is using a depression inventory—on which a score of 0 indicates no depression and a score of 10 indicates severe depression—to see if the level of depression in fourth graders in a particular class of 20 students differs from that of fourth graders in general at a school. The results of previous testing indicate that fourth graders at the school usually have a score of 5 on the scale, but the variation is unknown. The current sample of 20 fifth graders has a mean depression score of 4.4. -If the psychologist figures S = .85,the effect size (d)is

When carrying out a t test for dependent means with a mean difference score of 12 and a standard deviation of the distribution of means of 6,the t score is __________.(Give a number.)

The formula (M - μ)/ S_M is used to figure the __________.