Question 1 You want to determine whether the amount of coffee that “coffee drinkers” consume on a weekly basis differs depending on whether the coffee drinker also smokes cigarettes. You seek 20 volu

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Question 1

You want to determine whether the amount of coffee that “coffee drinkers” consume on a weekly basis differs depending on whether the coffee drinker also smokes cigarettes. You seek 20 volunteers from your college campus to participate.   Ten college students reported that they consume coffee but do not smoke cigarettes; these comprise the Coffee-Only group, or Group 1.  Another ten college students reported that they consumed coffee and also smoked cigarettes; these comprise the Coffee + Cigarettes group, or Group 2.  Then you ask them to monitor the frequency of 8 ounce cups of coffee they consumed over a seven day period.  The frequency of 8 ounce cups of coffee consumed in a week by each participant are listed below for each group.

X1                       X2Coffee-Only      Coffee + Cigarettes        13                 19

19                 25

17                25

11                 29

21                  35

20                 21

24                12

25                 28

22                 22

18                 27

Set alpah at α = .05, and complete step 4 of the hypothesis testing procedure, what decision should the researcher make regarding the effect of smoking cigarettes on coffee consumption?

A. The researcher should retain H0 and conclude that cigarette smoking has no effect on coffee consumption

B. The researcher should reject H0 and conclude that cigarette smoking has an effect on coffee consumption

C. The researcher should reject H0 and conclude that cigarette smoking decreases coffee consumption

D. The researcher should reject H0 and conclude that cigarette smoking has no effect on coffee consumption The researcher should reject HA and conclude that cigarette smoking has an effect on coffee consumption

Question 2

You want to determine whether the amount of coffee that “coffee drinkers” consume on a weekly basis differs depending on whether the coffee drinker also smokes cigarettes. You seek 20 volunteers from your college campus to participate.   Ten college students reported that they consume coffee but do not smoke cigarettes; these comprise the Coffee-Only group, or Group 1.  Another ten college students reported that they consumed coffee and also smoked cigarettes; these comprise the Coffee + Cigarettes group, or Group 2.  Then you ask them to monitor the frequency of 8 ounce cups of coffee they consumed over a seven day period.  The frequency of 8 ounce cups of coffee consumed in a week by each participant are listed below for each group.

X1                           X2

Coffee-Only       Coffee + Cigarettes

13                       19

19                       25

17                       25

11                        29

21                         35

20                        21

24                       12

25                       28

22                       22

18                       27

Set alpha at α = .05 and determine the critical value of t* that needs to be employed here.  The value of the appropriate of  t* is:

A. 1.725

B. 2.086

C.  2.101

D.  2.145

E 2.530

F. the correct value of t*  is not listed in alternatives “a” through “e”

Question 3

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       X1(Condition 1)                        X2 (Condition 2)

Number                          Standing Blood Pressure            Supine Blood Pressure

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 alpha at  α = .05, and summarize the results of the hypothesis testing procedure by putting your results in journal form.  Ignore the minus sign if your calculated t is negative.

A.  t (22) = 1.57, p  > .05

B.  t (11) = 1.57, p  < .05

C.t (12) = 2.20,  p  > .05

D.   t (24) = 2.50, p  <  .05

E. t (12) = 3.61, p < .05

F.  t (11) = 1.57 p  > .05

Question 4

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

Large dose of delta-9             X2 Placebo Group

THC Group

17                                              9

15                                            12

18                                              11

14                                              12

20                                              15

11                                              12

15                                              10

20                                             19

18                                             14

19                                              9

12                                              10

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 5

Eight White adults had been convicted of crimes of hate for their anti-Asian behaviors and were asked to participate in treatment as part of their probated court sentences. Part of the treatment package consisted of watching a movie designed to increase tolerance and appreciation of cultural diversity. A “Diversity Attitude Checklist” (DAC) was completed by each participant before and after watching the movie. Using the pre and post movie DAC scores below, test the researcher’s hypothesis that the movie will result in an increase in tolerance and appreciation for cultural diversity attitude (raise DAC scores). High scores on the “Diversity Attitude Checklist” indicate more tolerance and appreciation.

Participant             Pre-Movie DAC Score            After Movie DAC Score

A                               28                                            36

B                               25                                             25

C                                27                                           26

D                             29                                            31

E                              25                                            28

F                              21                                             22

G                              27                                           33

H                             25                                             29

With = .05, determine the critical value of t* that needs to be employed here. The value of the appropriate of t* is:

A.  1.895

B.  2.583

C. 2.365

D. 2.602

E. 2.896

F. 2.998

G. the correct value of t* is not listed in alternatives “a” through “f”

Question 6

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. Is this a one-tailed HA or a two-tailed HA ?

A. one-tailed

B. two-tailed

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