Question 1

If the p value associated with the F ratio in the analysis of variance indicates a significant difference in performance across three conditions,

Accepted Answer

A)  we will need to conduct post hoc tests to determine which pairs) of group means is/are significantly different. 
B)  we need to examine the individual sample group means to see which groups differ significantly. 
C)  each group differs significantly from all of the others. 
D)  there are no significant individual group differences. 
A)  we will need to conduct post hoc tests to determine which pairs) of group means is/are significantly different. 
B)  we need to examine the individual sample group means to see which groups differ significantly. 
C)  each group differs significantly from all of the others. 
D)  there are no significant individual group differences. A

Question 2

Justine decides to test the effects of playing violent video games on aggressiveness in 10-year old boys. She decides to have all boys play the three different types of video games in a randomized counterbalanced order. The levels of the within-subjects independent variable are violent, exciting but not violent, and neither exciting nor violent. After playing each video game each child takes a test designed to measure their level of aggression. What is the appropriate type of statistical test for Justine to use?

Accepted Answer

A)  one-way analysis of variance 
B)  two-way analysis of variance 
C)  one-way repeated measures analysis of variance 
D)  two-way mixed model analysis of variance 
A)  one-way analysis of variance 
B)  two-way analysis of variance 
C)  one-way repeated measures analysis of variance 
D)  two-way mixed model analysis of variance C

Question 3

In psychological experiments, the generally accepted rule is that the difference between groups is statistically significant if it would have happened by chance only of the time at most.

Accepted Answer

A)  50 percent 
B)  25 percent 
C)  5 percent 
D)  0 percent 
A)  50 percent 
B)  25 percent 
C)  5 percent 
D)  0 percent C

Question 4

Changing the alpha level from .05 to .01 would

Accepted Answer

A)  decrease the risk of a type I and a type II error. 
B)  increase the risk of a type I and a type II error. 
C)  decrease the risk of a type I error and increase the risk of a type II error. 
D)  increase the risk of a type I error and decrease the risk of a type II error. 
A)  decrease the risk of a type I and a type II error. 
B)  increase the risk of a type I and a type II error. 
C)  decrease the risk of a type I error and increase the risk of a type II error. 
D)  increase the risk of a type I error and decrease the risk of a type II error.

Question 5

Dr. Beckworth is interested in the effects of tutoring on success in calculus. She also knows that gender is an important issue in math success, so she factors that in as a second independent variable. She randomly assigns males and females to tutoring and no tutoring groups. She studies calculus success in the following four groups of participants: males who have received tutoring, females who have received tutoring, males who have not received tutoring, and females who have not received tutoring. What statistical test should she use to examine her results?

Accepted Answer

A)  independent samples t test 
B)  t test for correlation coefficient 
C)  one-way analysis of variance 
D)  two-way analysis of variance 
A)  independent samples t test 
B)  t test for correlation coefficient 
C)  one-way analysis of variance 
D)  two-way analysis of variance

Question 6

The mean of the sampling distribution of the mean is

Accepted Answer

A)  equal to 0. 
B)  equal to 100. 
C)  equal to the mean of the population. 
D)  depends on the size of the sample n). 
A)  equal to 0. 
B)  equal to 100. 
C)  equal to the mean of the population. 
D)  depends on the size of the sample n).

Question 7

A three-way ANOVA tests_________ null hypotheses.

Accepted Answer

A)  3 
B)  4 
C)  6 
D)  7 
A)  3 
B)  4 
C)  6 
D)  7

Question 8

What kind of effect can you examine with a two-way analysis of variance that you could not examine if you conducted multiple one-way analyses?

Accepted Answer

A)  the way in which each treatment effect increases as you add more independent variables 
B)  the interaction effect of the two ndependent variables 
C)  the degree to which either independent variable alone changes performance on the dependent variable 
D)  which groups) performed significantly better or worse than other groups) 
A)  the way in which each treatment effect increases as you add more independent variables 
B)  the interaction effect of the two ndependent variables 
C)  the degree to which either independent variable alone changes performance on the dependent variable 
D)  which groups) performed significantly better or worse than other groups)

Question 9

What is stated by the null hypothesis for the chi-square test for contingency tables?

Accepted Answer

A)  there is a relationship between the two categorical variables 
B)  there is no relationship between the two categorical variables 
C)  both variables have the same frequency distribution 
D)  the two variables have different frequency distributions 
A)  there is a relationship between the two categorical variables 
B)  there is no relationship between the two categorical variables 
C)  both variables have the same frequency distribution 
D)  the two variables have different frequency distributions

Question 10

A result that is statistically significant might not have ______significance. That is, it might not be important in a real world context.

Accepted Answer

A)  pragmatic 
B)  empirical 
C)  sensible 
D)  practical 
A)  pragmatic 
B)  empirical 
C)  sensible 
D)  practical

Question 11

A _____statistic follows a known sampling distribution and is used in significance testing.

Accepted Answer

A)  parameter 
B)  standard 
C)  test 
D)  point 
A)  parameter 
B)  standard 
C)  test 
D)  point

Question 12

_____is defined s the number of values that are free to vary.

Accepted Answer

A)  degrees of freedom 
B)  levels of freedom 
C)  measures of freedom 
D)  points of freedom 
A)  degrees of freedom 
B)  levels of freedom 
C)  measures of freedom 
D)  points of freedom

Question 13

Which of the following is NOT a measure of effect size.

Accepted Answer

A)  Cohen's d 
B)  eta squared η2) 
C)  chi-square χ2) 
D)  omega squared ώ2) 
A)  Cohen's d 
B)  eta squared η2) 
C)  chi-square χ2) 
D)  omega squared ώ2)

Question 14

While increasing statistical power is an advantage of directional alternative hypotheses, which one of the following is a disadvantage?

Accepted Answer

A)  Directional hypotheses are hard to use 
B)  When using directional alternative hypotheses you cannot reject the null if the outcome is large but in the opposite direction of the prediction 
C)  Directional hypothesis leads to an increase in degrees of freedom 
D)  There are no disadvantage to using directional hypotheses. 
A)  Directional hypotheses are hard to use 
B)  When using directional alternative hypotheses you cannot reject the null if the outcome is large but in the opposite direction of the prediction 
C)  Directional hypothesis leads to an increase in degrees of freedom 
D)  There are no disadvantage to using directional hypotheses.

Question 15

Suppose you conduct an experiment and find that the probability of obtaining your results by chance alone was 3% .03). Your decision, if your research is like most psychological research, should be to

Accepted Answer

A)  reject the null hypothesis. 
B)  accept the null hypothesis. 
C)  reject the alternative hypothesis. 
D)  use a different dependent variable. 
A)  reject the null hypothesis. 
B)  accept the null hypothesis. 
C)  reject the alternative hypothesis. 
D)  use a different dependent variable.

Question 16

The use of inferential statistics helps us decide whether to reject the null hypothesis by

Accepted Answer

A)  computing the probability that the alternative hypothesis is true. 
B)  computing the probability that the alternative hypothesis is false. 
C)  estimating the probability of obtaining observed group differences by chance alone. 
D)  computing how large a difference between two means has to be in order to be clinically relevant. 
A)  computing the probability that the alternative hypothesis is true. 
B)  computing the probability that the alternative hypothesis is false. 
C)  estimating the probability of obtaining observed group differences by chance alone. 
D)  computing how large a difference between two means has to be in order to be clinically relevant.

Question 17

To determine the dose-related effects of amphetamine on maze running, Dr. Symon randomly assigns his rats into four groups. The first group receives no amphetamine, the second group receives 0.5 mg/kg, the third group receives 1.0 mg/kg, and the fourth group receives 2 mg/kg. What initial statistical test should Dr. Symon use to examine the effects of the drug?

Accepted Answer

A)  independent samples t-test 
B)  one-way repeated measures analysis of variance 
C)  one-way analysis of variance 
D)  two-way analysis of variance 
A)  independent samples t-test 
B)  one-way repeated measures analysis of variance 
C)  one-way analysis of variance 
D)  two-way analysis of variance

Question 18

What is the main difference between a one-way and a two-way analysis of variance?

Accepted Answer

A)  a one-way analysis of variance is used when you have one independent variable and a two-way analysis of variance is used when you have two independent variables 
B)  one-way is used when you have matched groups and two-way is used when you have independent groups 
C)  one uses a one-way when working with an odd number of independent variables and a two-way when working with an even number 
D)  in a two-way, you compute the F ratio using two different methods, and take the F that is larger 
A)  a one-way analysis of variance is used when you have one independent variable and a two-way analysis of variance is used when you have two independent variables 
B)  one-way is used when you have matched groups and two-way is used when you have independent groups 
C)  one uses a one-way when working with an odd number of independent variables and a two-way when working with an even number 
D)  in a two-way, you compute the F ratio using two different methods, and take the F that is larger

Question 19

A type I error occurs whenever

Accepted Answer

A)  we correctly reject a false null hypothesis. 
B)  we incorrectly reject a true null hypothesis. 
C)  we incorrectly fail to reject a false null hypothesis. 
D)  we correctly fail to reject a false null hypothesis. 
A)  we correctly reject a false null hypothesis. 
B)  we incorrectly reject a true null hypothesis. 
C)  we incorrectly fail to reject a false null hypothesis. 
D)  we correctly fail to reject a false null hypothesis.

Question 20

If the empirical results of your independent samples t test allow you to reject the null hypothesis, this means that

Accepted Answer

A)  one group performed significantly differently than the other group. 
B)  you have no basis to conclude that your experimental treatment was effective. 
C)  the independent variable had no effect. 
D)  you were testing the wrong null hypothesis. 
A)  one group performed significantly differently than the other group. 
B)  you have no basis to conclude that your experimental treatment was effective. 
C)  the independent variable had no effect. 
D)  you were testing the wrong null hypothesis.

If the p value associated with the F ratio in the analysis of variance indicates a significant difference in performance across three conditions,

In psychological experiments, the generally accepted rule is that the difference between groups is statistically significant if it would have happened by chance only of the time at most.

Changing the alpha level from .05 to .01 would

The mean of the sampling distribution of the mean is

A three-way ANOVA tests_________ null hypotheses.

What kind of effect can you examine with a two-way analysis of variance that you could not examine if you conducted multiple one-way analyses?

What is stated by the null hypothesis for the chi-square test for contingency tables?

A result that is statistically significant might not have ______significance. That is, it might not be important in a real world context.

A _____statistic follows a known sampling distribution and is used in significance testing.

_____is defined s the number of values that are free to vary.

Which of the following is NOT a measure of effect size.

While increasing statistical power is an advantage of directional alternative hypotheses, which one of the following is a disadvantage?

Suppose you conduct an experiment and find that the probability of obtaining your results by chance alone was 3% .03). Your decision, if your research is like most psychological research, should be to

The use of inferential statistics helps us decide whether to reject the null hypothesis by

What is the main difference between a one-way and a two-way analysis of variance?

A type I error occurs whenever

If the empirical results of your independent samples t test allow you to reject the null hypothesis, this means that

Introduction to Scientific Research

Research Approaches and Methods of Data Collection

Problem Identification and Hypothesis Formation

Ethics

Measuring Variables and Sampling

Research Validity

Control Techniques in Experimental Research

Experimental Research Design

Procedure for Conducting an Experiment

Quasi-Experimental Designs

Single-Case Research Designs

Survey Research

Qualitative and Mixed Methods Research

Descriptive Statistics

Preparing the Research Report for Presentation or Publication

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Exam 15: Inferential Statistics

If the p value associated with the F ratio in the analysis of variance indicates a significant difference in performance across three conditions,

In psychological experiments, the generally accepted rule is that the difference between groups is statistically significant if it would have happened by chance only of the time at most.

Changing the alpha level from .05 to .01 would

The mean of the sampling distribution of the mean is

A three-way ANOVA tests_________ null hypotheses.

What kind of effect can you examine with a two-way analysis of variance that you could not examine if you conducted multiple one-way analyses?

What is stated by the null hypothesis for the chi-square test for contingency tables?

A result that is statistically significant might not have ______significance. That is, it might not be important in a real world context.

A _____statistic follows a known sampling distribution and is used in significance testing.

_____is defined s the number of values that are free to vary.

Which of the following is NOT a measure of effect size.

While increasing statistical power is an advantage of directional alternative hypotheses, which one of the following is a disadvantage?

Suppose you conduct an experiment and find that the probability of obtaining your results by chance alone was 3% .03). Your decision, if your research is like most psychological research, should be to

The use of inferential statistics helps us decide whether to reject the null hypothesis by

What is the main difference between a one-way and a two-way analysis of variance?

A type I error occurs whenever

If the empirical results of your independent samples t test allow you to reject the null hypothesis, this means that

Introduction to Scientific Research

Research Approaches and Methods of Data Collection

Problem Identification and Hypothesis Formation

Ethics

Measuring Variables and Sampling

Research Validity

Control Techniques in Experimental Research

Experimental Research Design

Procedure for Conducting an Experiment

Quasi-Experimental Designs

Single-Case Research Designs

Survey Research

Qualitative and Mixed Methods Research

Descriptive Statistics

Preparing the Research Report for Presentation or Publication

Filters