Quiz #1 -- Homework #1 & #2



Psyc941 Quiz #2 Hw#2: Univariate Tests

DON'T HAND IN THIS SHEET !!

The Story

A social psychologist wanted to examine how folks select their friends. In particular, she wanted to begin to understand things related to how someone decides whether or not to befriend an "odd person". Twenty-four volunteers from an Introductory Psychology class participated in the study. Each was asked to report their gender (1=male 2=female), age, and to indicate the

type of person they were most likely to become friends with (friend: 1=someone with shared interests, 2=someone with shared

background, 3=someone interesting to be around). Also, each person completed the Odd Friends Scale (OFS: the author claims

persons with higher scores are more likely to have odd friends, 30 items).

The last part of the questionnaire included a vignette. There were two versions of this vignette, and 12 participants were randomly assigned to receive each version. Both versions contained a story about a new neighbor who had moved in next

door and describes them as having a job as "an independent deep sea giblet recovery expert, with hobbies that all involve

imminent death or dismemberment". One version (coded 1) of the questionnaire tells that this new neighbor makes a concerted

and polite effort to "become friends", while the other version (coded 2) tells that they are "quite standoffish". After reading the story, each participant was asked to rate the likelihood of their befriending this new neighbor, using a 10-point scale (on which a "10" means they would certainly want to make friends with this person and a "1" means they would definitely not want to make friends with this person). This likelihood rating is the primary criterion/dependent measure for the study.

The Data

subn gender age friend OFS version rating

1 1 18 1 27 1 6

2 1 21 3 24 2 8

3 1 24 2 12 2 2

4 2 21 1 8 1 1

5 2 18 1 16 1 2

6 2 19 3 27 2 9

7 1 21 3 23 1 5

8 2 27 2 15 2 5

9 1 21 1 13 2 5

10 2 24 1 6 1 1

11 1 32 3 17 2 7

12 2 19 2 26 1 6

13 2 21 3 29 2 10

14 2 22 2 21 1 5

15 1 18 1 24 1 6

16 1 19 3 26 2 1

17 1 20 3 29 2 8

18 2 19 1 11 1 2

19 1 21 2 9 2 4

20 1 24 2 14 1 1

21 1 22 3 26 2 8

22 2 25 2 15 1 3

23 2 21 1 4 2 6

24 2 19 2 24 1 6

Psyc941 Quiz #2 Hw#2: Univariate Tests

HAND THIS SHEET IN !!

All write-ups should follow the examples given in the SPSS handouts !!

Write the data list, variable and value labels, and other stuff to get these data into the computer. Use FREQUENCIES to

obtain the following information for each variable. Copy the requested results into the blanks; it is not necessary to attach

the printout (save some paper and time).

Inferential stats

1. Variable Mean Std Dev

a. Age _______________ ______________ What is the sample size ? ______________

b. Gender _______________ ______________ Is the mean "meaningful"? If not, why not? If so, what does it tell you?

c. OFS _______________ ______________

d. Friend _______________ ______________ Is the mean "meaningful"? If not, why not? If so, what does it tell

e. The above statistics are labeled as "inferential" rather than "descriptive". What does that mean?

f. What, if anything, would we have done differently if we had intended these to be descriptive statistics?

Univariate inferential statistical tests

2. The researcher has intended to tap an undergraduate population with an average age of 21. Was this sample drawn from

an equivalent population?

a. proper stat test (don't say "t-test", tell which kind) ______________________

State the H0:

b. sample mean ____________ test stat value __________________ df _______________ p-value ______________

c. report the result of your statistical test:

3. The researcher thought that there would be about an equal proportion of the population in each of the response categories

of the Friend question. Was she correct?

a. proper stat test (don't say "Chi² tell which kind) ______________________

State the H0:

b. sample frequencies _____ _____ _____ test stat value ______________ df __________ p-value ______________

c. report the result of your statistical test:

4. The researcher thought that the average OFS score for the population represented by the sample would be about 15. Was she correct?

a. proper stat test (tell the specific kind) ______________________

State the H0:

b. sample mean ____________ test stat value __________________ df _______________ p-value ______________

c. report the result of your statistical test:

5. The researcher thought that there would be about three times as many females as males in the sample.

a. proper stat test (tell the specific kind) ______________________

State the H0:

b. sample frequencies _____ _____ test stat value ______________ df __________ p-value ______________

c. report the result of your statistical test:

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