381 Unit 3 Review Session

Which type of t-test should we run if we have a between-subjects design? Select all that apply.

• Dependent Samples

• Paired Samples

• Independent Samples

• Mixed Samples

Dr. Vari A. Bility is interested in how stress relieving techniques affect academic performance for university students. To study this, Dr. Bility has students from two different classes engage in a breathing technique before taking a test. In Week 1 of the study, each student used the breathing technique and took an English test. In Week 2, each student used the breathing technique and took a Math test. Data was collected as to the percent of correct answers on each test type. At the end of the study period, Dr. Bility analyzed the data in order to reveal whether this breathing technique had significant effects on each type of test scores. 

What design type would you classify this study as?

• Within-subjects Design

• Between-subjects Design

• Mixed-subjects Design

• Independent-Subjects Design

Dr. Vari A. Bility is interested in how stress relieving techniques affect academic performance for university students. To study this, Dr. Bility has students from two different classes engage in a breathing technique before taking a test. In Week 1 of the study, each student used the breathing technique and took an English test. In Week 2, each student used the breathing technique and took a Math test. Data was collected as to the percent of correct answers on each test type. At the end of the study period, Dr. Bility analyzed the data in order to reveal whether this breathing technique had significant effects on each type of test scores. 

What potential research hypothesis might you form about this study?

Answer explanation

I predict no difference in breathing technique between English & Math scores; this is because I believe the technique will help relieve stress on all tests (hence no difference between the test types).

Dr. Vari A. Bility is interested in how stress relieving techniques affect academic performance for university students. To study this, Dr. Bility has students from two different classes engage in a breathing technique before taking a test. In Week 1 of the study, each student used the breathing technique and took an English test. In Week 2, each student used the breathing technique and took a Math test. Data was collected as to the percent of correct answers on each test type. At the end of the study period, Dr. Bility analyzed the data in order to reveal whether this breathing technique had significant effects on each type of test scores. 

What is the scale of measurement of the outcome variable in this study?

Answer explanation

I predict no difference in breathing technique between English & Math scores; this is because I believe the technique will help relieve stress on all tests (hence no difference between the test types).

Dr. Vari A. Bility is interested in how stress relieving techniques affect academic performance for university students. To study this, Dr. Bility has students from two different classes engage in a breathing technique before taking a test. In Week 1 of the study, each student used the breathing technique and took an English test. In Week 2, each student used the breathing technique and took a Math test. Data was collected as to the percent of correct answers on each test type. At the end of the study period, Dr. Bility analyzed the data in order to reveal whether this breathing technique had significant effects on each type of test scores. 

What type of measurement is the outcome variable in this study?

• Ohysiological

• Self-report

• Behavioral

• None of the above

Dr. Vari A. Bility is interested in how stress relieving techniques affect academic performance for university students. To study this, Dr. Bility has students from two different classes engage in a breathing technique before taking a test. In Week 1 of the study, each student used the breathing technique and took an English test. In Week 2, each student used the breathing technique and took a Math test. Data was collected as to the percent of correct answers on each test type. At the end of the study period, Dr. Bility analyzed the data in order to reveal whether this breathing technique had significant effects on each type of test scores. 

What is a null hypothesis for this study?

Answer explanation

There will be no significant difference between English and Math test scores given this breathing technique.

Tags

CCSS.6.SP.B.5D

CCSS.HSS.ID.A.2

Dr. Vari A. Bility is interested in how stress relieving techniques affect academic performance for university students. To study this, Dr. Bility has students from two different classes engage in a breathing technique before taking a test. In Week 1 of the study, each student used the breathing technique and took an English test. In Week 2, each student used the breathing technique and took a Math test. Data was collected as to the percent of correct answers on each test type. At the end of the study period, Dr. Bility analyzed the data in order to reveal whether this breathing technique had significant effects on each type of test scores. 

What is an example of a different operational definition for the outcome variable in this study?

Answer explanation

Academic performance could be operationalized as the average number of correct answers out of 100 on history tests only.

How many participants were in Dr. Bility's study?

Answer explanation

Academic performance could be operationalized as the average number of correct answers out of 100 on history tests only.

Tags

CCSS.6.SP.B.5A

What does the mean value for 'English' mean in words?

Answer explanation

The average score for English was 82.74.

Tags

CCSS.6.SP.B.5B

What is the relationship between the two variables here? Include strength and direction.

Answer explanation

With a correlation coefficient of .243 we know there is a weak and positive relationship between these variables.

Tags

CCSS.HSS.ID.B.6B