Question 1

According to Cohen's conventions, an effect size of 0.012 for a one-way within-groups ANOVA is considered to be:

Accepted Answer

A)  small. 
B)  medium. 
C)  medium to large. 
D)  large.

Question 2

A researcher studying weight loss among overweight teenage girls wants to use a matched groups design to assess the effectiveness of three different diets.On which variable is it MOST important to match the participants?

Accepted Answer

A)  month of birth 
B)  favorite junk food 
C)  level of commitment to the study 
D)  percent of body fat

Question 3

Which statistical analysis can handle multiple measures or repeated measures based on the same individuals?

Accepted Answer

A)  one-way within-groups ANOVA 
B)  one-way between-groups ANOVA 
C)  paired-samples t test 
D)  independent-samples t test

Question 4

A one-way within-groups ANOVA is used when there is(are) _____ independent variable(s) with at least _____ levels.

Accepted Answer

A)  1; 2 
B)  2; 2 
C)  1; 3 
D)  2; 3

Question 5

A researcher interested in the impact of "dress-down Fridays" on work performance decides to study the impact of attire at work.She randomly selects 35 people at a large company to participate.Across the course of three weeks, she has all 35 participants experience working under three different levels of work attire: casual, dress-casual, and formal attire.How many post hoc tests will be needed to determine where significant differences occurred?

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  4

Question 6

For the data in the source table, what is the effect size for this one-way within-groups ANOVA? $$\begin{array} { l | c | c c | c | } 
\hline \text { Source } & S S & d f & M S & F \
\hline \text { Between-groups } & 39.52 & 2 & 19.76 & \
\hline \text { Subjects } & 6.45 & 5 & 1.29 & \
\hline \text { Within-groups } & 19.93 & 10 & 1.993 & \
\hline \text { Total } & 53 & 17 & & \
\hline
\end{array}$$

Accepted Answer

A)  small 
B)  medium 
C)  large 
D)  very large

Question 7

Which of these is a potential problem with a matched-groups design for ANOVA?

Accepted Answer

A)  Participant loss in one group can cause increase in participants overall. 
B)  We may not be aware of all of the important variables of interest. 
C)  Time commitment for participants is low. 
D)  Statistical power is reduced.

Question 8

Determine the critical cutoff for F at a p level of 0.05 if the following degrees of freedom were calculated for a one-way within-groups ANOVA: dfbetween = 2, dfsubjects = 9, dftotal = 29, dfwithin = 18.

Accepted Answer

A)  6.01 
B)  4.26 
C)  3.74 
D)  3.56

Question 9

_____ sums of squares must be calculated in a within-groups ANOVA.

Accepted Answer

A)  Five 
B)  Two 
C)  Three 
D)  Four

Question 10

The one-way within-groups design can be viewed as an extension of which other research design because of its ability to analyze data from more groups?

Accepted Answer

A)  independent-samples t test 
B)  paired-samples t test 
C)  Tukey HSD test 
D)  between-groups ANOVA

Question 11

According to Cohen's conventions, an effect size of 0.16 for a one-way within-groups ANOVA is considered to be:

Accepted Answer

A)  small. 
B)  medium. 
C)  medium to large. 
D)  large.

Question 12

A between-groups hypothesis test is preferred over a within-groups hypothesis test.

Accepted Answer

A) True 
 B)False

Question 13

The one-way within-groups ANOVA has a new source of variability, known as the subjects sum of squares.To calculate this sum of squares, subtract:

Accepted Answer

A)  each participant's scores from the mean and sum the differences. 
B)  the grand mean from the mean of each cell. 
C)  the sum of squares within from the sum of squares total. 
D)  the grand mean from each participant's mean for all of his or her scores.

Question 14

The one-way within-groups ANOVA is used when there are:

Accepted Answer

A)  two independent variables that all participants experience and at least two dependent measures. 
B)  a scale independent variable with multiple levels that all participants experience. 
C)  two or more ordinal variables with multiple levels and a scale dependent variable. 
D)  one nominal or ordinal independent variable with more than two levels, a scale-dependent variable, and every participant is in every group.

Question 15

Following a one-way within-groups analysis of variance that results in a significant F statistic, the researcher should:

Accepted Answer

A)  replicate the research with matched groups. 
B)  conduct post hoc tests to determine where the significant differences between levels of the independent variable exist. 
C)  conduct planned comparisons to explore where differences may exist when you are unsure. 
D)  conduct a power analysis.

Question 16

For the data in the source table, calculate the F statistic of interest to researchers. $$\begin{array} { l | c | c c | c | } 
\hline \text { Source } & S S & d f & M S & F \
\hline \text { Between-groups } & 10.1 & 2 & 5.05 & \
\hline \text { Subjects } & 7.4 & 4 & 1.85 & \
\hline \text { Within-groups } & 8.5 & 8 & 1.063 & \
\hline \text { Total } & 26 & 14 & & \
\hline
\end{array}$$

Accepted Answer

A)  4.75 
B)  2.73 
C)  1.74 
D)  0.21

Question 17

Determine the critical cutoff for F at a p level of 0.05 if the following degrees of freedom were calculated for a one-way within-groups ANOVA: dfbetween = 4, dfsubjects = 5, dftotal = 29, dfwithin = 20.

Accepted Answer

A)  2.25 
B)  2.87 
C)  3.01 
D)  5.19

Question 18

_____ is(are) an additional assumption that must be evaluated in a within-groups ANOVA compared to a between-groups ANOVA.

Accepted Answer

A)  Random sampling 
B)  Order effects 
C)  Sample size 
D)  Mean differences

Question 19

What is the correct formula for subjects degrees of freedom in a one-way within-groups ANOVA?

Accepted Answer

A)  Ngroups - 1 
B)  n - 1 
C)  Ntotal - 1 
D)  n - 2

Question 20

_____ degrees of freedom must be calculated in a within-groups ANOVA.

Accepted Answer