Question 7 A biopsychologist is studying the role of the role of marijuana (THC) on aggression in rats. Specifically, the researcher asserts that the influence of large doses of marijuana will make r

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Question 7

A biopsychologist is studying the role of the role of marijuana (THC) on aggression in rats. Specifically, the researcher asserts that the influence of large doses of marijuana will make rats more aggressive. Twenty two rats are randomly assigned to one of two groups. The active ingredient in marijuana is called delta-9 THC. One group of 11 rats serves as a control group and receives a placebo (via injection). A second group of 11 different rats receives a large dose of delta-9 THC via injection. These rats have not been paired up on any trait. Then the researcher tests the animals by recording the number of aggressive responses each of the rats display in a 30 minute test period one hour after the rats were injected. The data are presented below, and represent the number of aggressive responses per rat in each group.

X1                                                     X2

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Placebo Group                              X2 Placebo Group

Large dose of delta-9

THC Group

17                                                 9

15                                              12

18                                              11

14                                              12

20                                             15

11                                              12

15                                            10

20                                             19

18                                              14

19                                              9

12                                             10

With = .01, determine the critical value of t* that needs to be employed here. The value of the appropriate of t* is:

A.  2.086

B.  2.764

C. 2.845

D.  3.169

E. 3.250

F. 2.528

Question 8

You want to determine whether “noise” makes a difference in college students’ ability to memorize new information. You randomly divide 16 college sophomores into two groups with eight participants each. The participants in both groups are asked to memorize a list of 20 nonsense syllables (such as “TSG”, “JMB”, and so on) during a five-minute study period. The participants in Group 1 study the nonsense syllables with a “noisy” background, while those in Group 2 study the syllables with a “no noise” background. After the five-minute study period all participants receive a distracter task wherein they must count backward from 100 by sevens (for example, 100, 93, 85, and so on) for one minutes. At the end of this one minute of counting backward, each participant is asked to recall as many of the original nonsense syllables as possible. The scores below are the number of nonsense syllables each participant correctly recalled.

X1                                        X2

(“Noisy”, Group 1)           (“No Noise”, Group 2)

13                                         9

9                                         5

7                                          5

11                                       9

12                                       9

10                                     11

14                                   12

11                                     7

Which of the following are the correct statements of the null and alternate hypotheses, H0 and HA ?

A. H0: µ1 = µ2 and HA: µ1 µ2

B. H0: µ1 µ2 and HA: µ1 = µ2

C. H0: µ1 > µ2 and HA: µ1 µ2

D. H0: µ1 µ2 and HA: µ1 > µ2

E. H0: µ1 < µ2 and HA: µ1 µ2

F. H0: µ1 µ2 and HA: µ1 < µ2

Question 9

An educator was interested in “cooperative play” versus “competitive play” activities as they might influence the ability of 5th grade students to make friends with their classmates. Specifically, the educator speculates that there will be a difference between the two conditions that will foster the acquisition of more friends, but the educator is not sure which way the difference will go. On a random basis, the educator divided a class of twenty 5th graders into two different styles of “play” activities at recess: a cooperative play group of ten children in which students relied on one another in order to get “team” recess activity points; and a competitive group of ten children in which students worked individually to outperform their classmates to get recess activity points. The data are presented below, and represent the number of classmates chosen by students as their friends at the end of the semester.

Competitive Group              Cooperative Group

X1                                        X

3                                         6

4                                          7

5                                          4

4                                         3

1                                        6

1                                       9

8                                       10

3                                      4

4                                       6

2                                      9

Which hypothesis test needs to be employed here, the two-sample dependent t test or the two-sample independent t test?

A.  dependent t test

B.  independent t test

Question 10

Blood pressure is measured in millimeters of mercury (mm Hg) and recorded with the systolic number first, followed by the diastolic number.  You want to determine whether one’s systolic blood pressure differs depending on whether its measured while standing or supine (lying flat on one’s back).  You gather 12 college students willing to participate and then measure their systolic blood pressures in both positions, 10 minutes apart: first standing (call this Condition 1), then supine (call this Condition 2). Their scores are below.

Participant Number             Standing Blood Pressure         Supine Blood Pressure

X2 (Condition 2)                               X1(Condition 1)                                             X2 (Condition 2)

1                                                             132                                        136

2                                                            146                                         145

3                                                            135                                        140

4                                                            141                                        147

5                                                         139                                         142

6                                                          162                                       160

7                                                           128                                        137

8                                                          137                                        136

9                                                       145                                       149

10                                                     151                                       158

11                                                    131                                        120

12                                                   143                                        150

Set alpah at  α = .05, and complete step 4 of the hypothesis testing procedure, what decision should the researcher make regarding the difference body position makes on systolic blood pressure?

A.  The researcher should reject H0     and conclude that body position makes a difference in the measure  of  systolic blood pressure

B. The researcher should reject H0    and that body position makes no difference in the measure  of  systolic blood pressure

C. The researcher should reject H0 and conclude that systolic blood pressure is higher in the supine position than the standing position.

D. The researcher should reject HA and that body position makes no difference in the measure  of  systolic blood pressure

E. The researcher should retain H0 and conclude that body position makes no difference in the measure of  systolic blood pressure

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