Dr. Dunn is conducting some research involving a new math learning program. To test the effectiveness of the new math program, he selects two sections of his high school math classes to participant in his study.
His 1st period 9th grade math class will be the experimental group and his 4th period 11th grade math class will be the control group. Which of the following confounding variable threats is possible in this example?
a. selection-maturation
b. selection-instrumentation
c. selection-testing
d. selection-regression
Question 2
When evaluating the validity of information on the internet, which of the following is important information to find on the authority of an author?
a. number of testimonials
b. email address
c. credentials
d. opinions
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this is a math question
Research Methods