psych 2300 ch 12 quiz

WORKING MEMORY EXPERIMENT QUESTION 3 How many interaction effects are possible for this experiment? *You are not telling me whether or not there is an interaction effect, but rather how many possible interactions must we investigate given the experimental design. -3 -1 -4 -0 -2

1

WORKING MEMORY EXPERIMENT QUESTION 4 What type of factorial design is being used? -2x2 -2x2x2 -3x3 -3x3x2 -3x3x3

3x3

*use graph* T or F: There is a main effect for the independent variable of age.

false

T or F: The calculation of marginal means uses a simple average even when the sample size is unequal between experimental conditions.

false

WORKING MEMORY EXPERIMENT QUESTION 2 T or F: The experiment uses a full counterbalance design for the order of injections.

false

WORKING MEMORY EXPERIMENT QUESTION 6 Assume that the experimental design was changed so that instead of all rats receiving all injections you have 3 separate groups of rats (Group 1 receives saline, group 2 receives PCP, group 3 receives PCP and galantamine ). Assume all other aspects of the experiment are the same (all rats exposed to all delay lengths). This new experimental design is what type of factorial design? -independent group design -mixed group design -within group design

mixed group design

WORKING MEMORY EXPERIMENT QUESTION 1 Normal rats are tested in a working memory task. In this task rats learn to hold a visual stimulus (in working memory) over a delay period. Performance in the task is measured as the percentage of correct choices at each delay length (5, 10, and 15 seconds). All delay lengths are presented within the same single experimental session (120 trials) with the order of delays randomized (example order: 15sec, 5, 5, 5, 10, 15, 10...etc.) After animals learn how to perform the task the following experiment is conducted: All animals underwent three sequential days of testing (separate experimental sessions) in the task (day:1,2,3). Prior to each testing day all animals received one of the following injections A. Saline B. PCP (induces deficit) C. PCP + Galantamine (potential treatment) Animals are randomly assigned to the following orders of injections: ACB, BAC, CBA. The experiment produces the following data: In the scenario what type of experimental design is used? -pre-test/ post-test and concurrent measures design -concurrent measures design -repeated measures and concurrent measures design -post-test only and concurrent measures design -pre-test/ post-test design

repeat measures and concurrent measures design

*use graph* Assume the following graph represents the two-way interaction during heavy traffic. (You can go ahead and assume that there is a significant difference between ages for both the soda pop and alcohol conditions) and the following graph represents the two-way interaction during light traffic. (You can go ahead and assume that there is a significant difference between ages for the alcohol condition but not the soda pop condition) T or F: Examining both graphs, we can conclude that there is a three-way interaction between drink type, age, and traffic condition.

true

WORKING MEMORY EXPERIMENT QUESTION 5 Scientists attempt to determine if there are any order effects by comparing the results of each dose order used. For those orders in which PCP alone was given prior to saline the animals receiving the saline condition performed worse than normal. In other words the peformance of animals when receiving saline day 1 (order ACB) is significantly higher than when saline is given day 2 (order BAC). T or F: This result in the data indicates a type of order effect called a carryover effect. One possible solution to this problem would be to separate out the testing sessions to give more time for PCP to exit the body. (For example testing on day 1, 5, 10 rather than day 1,2,3). --------------------------- Orders copied from question 1: A. Saline B. PCP (induces deficit) C. PCP + Galantamine (potential treatment) Animals are randomly assigned to the following orders of injections: ACB, BAC, CBA.

true