One of the authors of your textbook conducted a study on monitor ...

[rlane42]

One of the authors of your textbook conducted a study on monitor size and reaction time. The research matrix is given below.
 
  17 inch 19 inch 21 inch
  25 participants 25 participants 25 participants
  If you wanted to give every participant in the study a piece of paper with the contact information of the researchers, how many pieces of paper will you need for this between subjects design?
 
  a. 25
  b. 50
  c. 75
  d. 100

Question 2

When a change in the dependent variable could be due to an event beyond the researcher's control, _________ is a threat to internal validity.
 
  a. history
  b. maturation
  c. regression to the mean
  d. selection

[Natalie4ever]

Answer to Question 1

C

Answer to Question 2

A

[rlane42]

Excellent

[milbourne11]

Gracias!