Choosing the correct t test

A professor compares final exam scores in his psychology class to final exam grades in another comparable professor's class. Assuming that the population variance of exam scores is unknown, what type of t test is appropriate for analyzing differences between these classes?

Independent sample t test

A researcher records differences in helping behavior among participants randomized to interact with a child or an adult for 30 minutes. The researcher asks participants a series of questions about their willingness to help on tasks. Assuming that the population variance is unknown, what type of t test is appropriate for this study?

Independent sample t test

a. A study measuring differences in attitudes about morality among men and women. Which kind of t test should be used?

Independent samples t test

a. An experiment measuring differences in brain activity among rats placed on either a continuous or intermittent reward schedule. Which kind of t test should be used?

Independent samples t test

A researcher conducts a study comparing the obesity rate in a small community to the known obesity rate in the United States. Assuming that the population variance in unknown, what type of t test is appropriate for this study?

One sample t test

a. A study testing whether night-shift workers sleep the recommended 8 hours per day. Which kind of t test should be used?

One sample t test

A researcher matched 30 participants on intelligence (hence 15 pairs of participants), and then compared differences in emotional responsiveness to two experimental stimuli between each pair

Related sample t test

A researcher records the time it takes (in seconds) for participants to respond (by pressing a key) to a familiar and an unfamiliar word flashed onto a computer screen. In this study, the difference in response time for each participant is compared.

Related sample t test

A professor compares scores on a competency exam among students at two times during a single semester. What type of t test is most appropriate for this study?

Related sample t test Repeated measures design

One-sample t test

compares a single sample mean to a known population mean

Independent sample t test

compares two means from 2 unrelated groups

A researcher asks a sample of brothers and sisters to rate how positive their family environment was during childhood. In this study, the differences in ratings between each brother and sister pair were compared. The type of design described here is called a ______.

matched-samples design

A researcher compares the difference in the amount of texting by students in class during the first week and last week of classes. The type of design described here is called a ______.

repeated-measures design