Practice Exam 1, 2, and Final

Question 1

Eta scuare analysis of variance as …….is to……..

Answer 1

coefficient of determination/correlation

Question 2

A 4 X 3 factorial design would have how many factors

Answer 2

12

Question 3

In a two-factor analysis of variance a main effect is defined as the:

Answer 3

mean differences among the levels of one factor

Question 4

In a 2 X 2 ANOVA, there are…….separate null hypotheses

Answer 4

3

Question 5

In a positive relationship

Answer 5

as X increases, Y increases……..as X decreases, Y decreases

Question 6

In a negative relationship

Answer 6

as X increases, Y decreases

Question 7

Y’ can most accurately predict from X if the correlation between X and Y is……

Answer 7

-0.98

Question 8

If there is a positive correlation between X and Y then the regression equation, Y’ = a + bX will have

Answer 8

b > 0; B is greater than zero

Question 9

As the differences between expected and observed frequencies increases

Answer 9

the likelihood of rejecting Ho also increases

Question 10

A chi-square to see if political afflimation (republican, democrat, independent) is related to religious affiliation (Protestant, Catholic, Jew, non-denominational) is a :

Answer 10

3 X 4 chi-square

Question 11

The null hypothesis in the chi-square test for independence is that

Answer 11

the data exceed expected frequencies

Question 12

If we found that position on abortion (pro-life vs. pro-choice) depended on gender, what would be the proper citation?

Answer 12

X^2 (1, N=100)=4.22, p

Question 13

We talked in class about Nielsen Ratings of television shows. If we predicted that “Friends” will have a 2000 Nielsen Rating of 27 with a standard Error of Estimate = 3, the 95% confidence interval for this prediction is:

Answer 13

25.5 to 28.5

Question 14

If grade point average (Y) and number of hours partying per week (X) were inversely related according tot he following linear model: Y’ = 4.00 - 0.4X, what GPA would you predict if you partied for 8 hours a week?

Answer 14

3.68

Question 15

Which correlation describes a situation where the value of one variable decreases as the value of the other variable decreases?

Answer 15

0.01

Question 16

In the linear equation Y’ = 8 + 5X, when X increases by 2 points, Y’ will increase by

Answer 16

5 points

Question 17

For the regression equation: Y’ = 3.92X - 2.69, the value 3.92 is:

Answer 17

an outlier

Question 18

If r = -0.2, the strength of the relation is:

Answer 18

2%

Question 19

Among frequency distributions for physical stamina scores, the greatest variability likely would occur in:

Answer 19

the general population

Question 20

Friedmann studied the effects of pet ownership on the survival rates of individual suffering from coronary heart disease. He simply noted if patient were alive or dead at the end of the year-long study. Alive and dead are representative of:

Answer 20

nominal scale measurement

Question 21

Hugenberg (2007) found that giving people instructions about distinguishing characteristics to look for in recognizing faces affected both their ability to recognize African-American black faces and their ability to recognize:

Answer 21

faces of their own, European white American ethnicity

Question 22

Mehl (2007) debunked the notion that women, in a romantic relationship, talk and communicate more (3X as many words spoken) than their male partners. He found that when one member of the couple talks more the other talks less. This pattern showed up in his research as:

Answer 22

A negative correlation, an inverse relation, and a moderate relationship.

Question 23

“The bigger they are, the harder they fall” describes

Answer 23

A positive correlation

Question 24

If r^2 = 0.36, what can we conclude?

Answer 24

36% of the variance is error

Question 25

Buckalew, Daly, and Coffield (1986) studied the relation between attendance on the day of class and a student's final grade in the course. Those who attended the first day had an average course GPA = 3.12 and those who did not attend class the first day had an average course GPA = 2.86. What scale of measurement is attendance on the first day?

Answer 25

Nominal

Question 26

Suppose you conduct an independent groups experiment with 24 subjects divided into 2 groups and F = 15.37. This is a statistically significant F. Which of the following is the correct way to report it?

Answer 26

F(1,22;MSe = 2.78) = 15.37, p

Question 27

Which one of the following is an ethical issue in research?

Answer 27

degree of voluntary participation, privacy, and withholding beneficial treatments

Question 28

The hypothesis of "no effect" is

Answer 28

the null hypothesis

Question 29

On a normal distribution, the scores that lie in the tails of the distribution have

Answer 29

a low frequency and a low probability of occurring

Question 30

The appropriate statistical test for nominal level data is

Answer 30

chi-square

Question 31

If we say we have statistically significant results, we mean the results are

Answer 31

likely to be due to true differences between the groups

Question 32

Suppose a students misses a statistics quiz. The class average on a quiz was 75 and the standard deviation was 6. What would we most likely expect the student's score to be?

Answer 32

between 69 and 81

Question 33

The quantity N - 1 has a special name. It is:

Answer 33

degrees of freedom

Question 34

Which section of an APA paper includes figures, tables, and interpretation of your statistical analysis?

Answer 34

results

Question 35

All pro football players constitute a.......

Answer 35

population

Question 36

The Dallas Cowboys are a........

Answer 36

sample

Question 37

Weight is an example of a.....

Answer 37

dependent variable

Question 38

Which of the following points is not on the line defined by the regression equation Y' = 2X + 3

Answer 38

X = 2 and Y = 6

Question 39

determining a persons sex involves measurement on a ________ scale of measurement

Answer 39

nominal

Question 40

determining a persons reaction time involves measurement on an _______ scale of measurement

Answer 40

interval/ratio

Question 41

a recent report concludes that rats given vitamin supplements have better maze learning scores than rats on a regular diet. for this study the IV is?

Answer 41

type of diet

Question 42

a recent study with college students reports that reaction times in the morning are faster than reaction times in the afternoon for this report reaction time is the

Answer 42

dependent variable

Question 43

a distribution consists of the scores 5,5,6,6,6,6,6,7,7,15,24,30,39 the shape of the distribution is

Answer 43

skewed to the right

Question 44

if a population consists of N=10 scores has a mean of 30 and a standard deviation of 4, then the variance equals?

Answer 44

16

Question 45

suppose you earned a score of 40 on the exam, which parameter would give you the highest grade?

Answer 45

mean=45 | s=10

Question 46

which is not a measure of variability?

Answer 46

mean

Question 47

a positive deviation score indicates that the raw score is

Answer 47

greater than the mean

Question 48

if howard had a z score of -2 on his statistics quiz according to the corresponding perfect z distribution what percent of his classmates scored higher on the quiz

Answer 48

more than 95%

Question 49

if a sample consists of 16 individuals then df for these scores in a one sample t test would be

Answer 49

15

Question 50

when the null hypothesis is true for an ANOVA the expected value for the F ratio is

Answer 50

1.00

Question 51

for an F ratio with df=3,20 from an independent groups ANOVA how many treatment conditions were compared?

Answer 51

4

Question 52

which of the following is statistical tests for doing post hoc pair wise comparisons?

Answer 52

LSD tests

Question 53

suppose you perform an ANOVA on 18 people divided into three groups. your F =9.15 (significant) which of the following is the correct way to report this finding?

Answer 53

F(2,15;MSe=23.34)=9.15, p

Question 54

rejecting the null hypothesis when its true is a _______ error not rejecting a false null hypothesis is a _______ error

Answer 54

type 1 / type 2

Question 55

the effect of the IV on the DV is called

Answer 55

subject variance

Question 56

in ANOVA within groups variability refers to

Answer 56

sampling error

Question 57

in an ANOVA summary table MSe stands for

Answer 57

variance

Question 58

a researcher reports F(3,20;MSe=12.78)=27, p

Answer 58

less than 5 in 100

Question 59

post hoc tests such as LSD are used after an ANOVA whenever

Answer 59

the null hypothesis is rejected there are more than two treatments you wish to detect differences between pairs of means

Question 60

the amount of difference between groups that can be accounted for by the IV is expressed numerically by

Answer 60

eta square

Question 61

if you want to compare 2 means you should conduct ________. if you want to compare 3 means you should conduct _________. if you want to compare more than 3 means you should

Answer 61

t test ANOVA ANOVA

Question 62

which of the following points is not on the line defined by the regression Y'=2x+3

Answer 62

x=2 | y=6

Question 63

the quantity N-1 has a special name

Answer 63

degrees of freedom

Question 64

statistically significant means

Answer 64

likely to be due to true differences between the groups

Question 65

interval data example

Answer 65

gpa

Question 66

if r2 =.36 then

Answer 66

we will be 36% more accurate predicting Y scores

Question 67

among frequency distribution for physical stamina scores, the greatest variability likely would occur in

Answer 67

the general population