Question 1

The z statistic is a z transformation for a distribution of sample means.

Accepted Answer

A) True 
 B)False

Question 2

A professor gives an exam in which the mean score is 78 points.She gives another exam to test whether or not scores change.In this example,the null hypothesis is

Accepted Answer

A)  $\mu$ $\neq$ 78 
B)  M $\neq$ 78 
C)  $\mu$ = 78 
D)  M = 78 
A)  $\mu$ $\neq$ 78 
B)  M $\neq$ 78 
C)  $\mu$ = 78 
D)  M = 78

Question 3

A researcher obtains z = 1.80 for a one-sample z test.What is the decision for this test at a .05 level of significance?

Accepted Answer

A)  to reject the null hypothesis 
B)  to retain the null hypothesis 
C)  it depends on whether the test is one-tailed or two-tailed 
A)  to reject the null hypothesis 
B)  to retain the null hypothesis 
C)  it depends on whether the test is one-tailed or two-tailed

Question 4

The probability of correctly rejecting a false null hypothesis is called the power of the decision-making process.

Accepted Answer

A) True 
 B)False

Question 5

If a researcher obtains a null finding,then what is the decision?

Accepted Answer

A)  They correctly rejected the null hypothesis. 
B)  They incorrectly rejected the null hypothesis. 
C)  They correctly retained the null hypothesis. 
D)  They failed to make a decision. 
A)  They correctly rejected the null hypothesis. 
B)  They incorrectly rejected the null hypothesis. 
C)  They correctly retained the null hypothesis. 
D)  They failed to make a decision.

Question 6

What is the typical level of significance for a hypothesis test in behavioral research?

Accepted Answer

A)  .05 
B)  .10 
C)  .001 
D)  .50 
A)  .05 
B)  .10 
C)  .001 
D)  .50

Question 7

The first step to hypothesis testing requires that a researcher

Accepted Answer

A)  state the hypotheses. 
B)  make a decision. 
C)  compute a test statistic. 
D)  conduct a study. 
A)  state the hypotheses. 
B)  make a decision. 
C)  compute a test statistic. 
D)  conduct a study.

Question 8

Which of the following statements regarding the null hypothesis is true?

Accepted Answer

A)  The null hypothesis always makes statements about a population parameter. 
B)  A decision in hypothesis testing is made about the alternative hypothesis, not the null hypothesis. 
C)  The null hypothesis is the only hypothesis stated in hypothesis testing. 
D)  All of these. 
A)  The null hypothesis always makes statements about a population parameter. 
B)  A decision in hypothesis testing is made about the alternative hypothesis, not the null hypothesis. 
C)  The null hypothesis is the only hypothesis stated in hypothesis testing. 
D)  All of these.

Question 9

______ allows researchers to describe (1)how far mean scores have shifted in the population or (2)the percentage of variance that can be explained by a given variable.

Accepted Answer

A)  Significance 
B)  Probability 
C)  Power 
D)  Effect size 
A)  Significance 
B)  Probability 
C)  Power 
D)  Effect size

Question 10

The value of power is influenced by the alpha level,sample size,and effect size.

Accepted Answer

A) True 
 B)False

Question 11

A researcher obtains z = 1.45 for a one-sample z test.What is the decision for this test at a .05 level of significance?

Accepted Answer

A)  to reject the null hypothesis 
B)  to retain the null hypothesis 
C)  it depends on whether the test is one-tailed or two-tailed 
D)  there is not enough information to make a decision 
A)  to reject the null hypothesis 
B)  to retain the null hypothesis 
C)  it depends on whether the test is one-tailed or two-tailed 
D)  there is not enough information to make a decision

Question 12

Which of the following is not one of the four steps to hypothesis testing?

Accepted Answer

A)  state the hypotheses 
B)  identify hypothetical data 
C)  set the criteria for a decision 
D)  compute the test statistic 
A)  state the hypotheses 
B)  identify hypothetical data 
C)  set the criteria for a decision 
D)  compute the test statistic

Question 13

Given the following values: $\mu$ = 6.0,M = 7.6,n = 36, $\sigma$ = 6,conduct a one-sample z test at a .05 level of significance.For a one-tailed test,upper-tail critical,what is the decision?

Accepted Answer

A)  to reject the null hypothesis 
B)  to retain the null hypothesis 
C)  There is not enough information since the sample size is not given. 
A)  to reject the null hypothesis 
B)  to retain the null hypothesis 
C)  There is not enough information since the sample size is not given.

Question 14

The power of the decision-making process is

Accepted Answer

A)  stated by an alpha level. 
B)  the likelihood of rejecting a false null hypothesis. 
C)  the same as a null finding. 
D)  the likelihood of committing a Type I error. 
A)  stated by an alpha level. 
B)  the likelihood of rejecting a false null hypothesis. 
C)  the same as a null finding. 
D)  the likelihood of committing a Type I error.

Question 15

A researcher reports that scores were higher than the mean in the population,z = 1.60,p = .05 (d = 0.14).If this was a test at a .05 level of significance,then what value must be incorrectly reported?

Accepted Answer

A)  the effect size or alpha level 
B)  the p value or the test statistic 
C)  the alpha level or the test statistic 
D)  the test statistic or the effect size 
A)  the effect size or alpha level 
B)  the p value or the test statistic 
C)  the alpha level or the test statistic 
D)  the test statistic or the effect size

Question 16

One-tailed tests will rarely,if ever,result in decisions that are different from two-tailed tests in hypothesis testing.

Accepted Answer

A) True 
 B)False

Question 17

A researcher obtains z = 2.04 for a one-sample z test.What is the decision for this test at a .05 level of significance?

Accepted Answer

A)  to reject the null hypothesis 
B)  to retain the null hypothesis 
C)  it depends on whether the test is one-tailed or two-tailed 
D)  there is not enough information to make a decision 
A)  to reject the null hypothesis 
B)  to retain the null hypothesis 
C)  it depends on whether the test is one-tailed or two-tailed 
D)  there is not enough information to make a decision

Question 18

A researcher computes a one-sample z test in two studies.Both studies used the same alpha level,placed the rejection region in both tails,and measured the same sample mean.The researcher selects a sample of 30 participants in Study 1 and decides to retain the null hypothesis.She selects a sample of 60 participants in Study 2 and decides to reject the null hypothesis.Which of the following is the best explanation for why the decision was different in Study 1 and Study 2?

Accepted Answer

A)  The different decisions in Study 1 and Study 2 are not possible because all values were the same. 
B)  The different decisions in Study 1 and Study 2 are not possible because the researcher tested the same hypothesis. 
C)  The different decisions in Study 1 and Study 2 are due to an error the researcher made in the first hypothesis test. 
D)  The different decisions in Study 1 and Study 2 are possible because the second test was associated with greater power to detect an effect. 
A)  The different decisions in Study 1 and Study 2 are not possible because all values were the same. 
B)  The different decisions in Study 1 and Study 2 are not possible because the researcher tested the same hypothesis. 
C)  The different decisions in Study 1 and Study 2 are due to an error the researcher made in the first hypothesis test. 
D)  The different decisions in Study 1 and Study 2 are possible because the second test was associated with greater power to detect an effect.

Question 19

A researcher reports the following result for a one-sample z test at a .05 level of significance: z = 1.88,p = .06 (d = 0.25).Is this result significant?

Accepted Answer

A)  Yes, the decision is to reject the null hypothesis. 
B)  Yes, because the effect size is large hypothesis. 
C)  No, the decision is to retain the null hypothesis. 
D)  No, because the effect size is small hypothesis. 
A)  Yes, the decision is to reject the null hypothesis. 
B)  Yes, because the effect size is large hypothesis. 
C)  No, the decision is to retain the null hypothesis. 
D)  No, because the effect size is small hypothesis.

Question 20

Which of the following best describes the p value.

Accepted Answer

A)  It is the same as an alpha level. 
B)  It is a conditional probability. 
C)  Its value must be greater than .05 to reject the null hypothesis. 
D)  All of these. 
A)  It is the same as an alpha level. 
B)  It is a conditional probability. 
C)  Its value must be greater than .05 to reject the null hypothesis. 
D)  All of these.

The z statistic is a z transformation for a distribution of sample means.

A professor gives an exam in which the mean score is 78 points.She gives another exam to test whether or not scores change.In this example,the null hypothesis is

A researcher obtains z = 1.80 for a one-sample z test.What is the decision for this test at a .05 level of significance?

The probability of correctly rejecting a false null hypothesis is called the power of the decision-making process.

If a researcher obtains a null finding,then what is the decision?

What is the typical level of significance for a hypothesis test in behavioral research?

The first step to hypothesis testing requires that a researcher

Which of the following statements regarding the null hypothesis is true?

______ allows researchers to describe (1)how far mean scores have shifted in the population or (2)the percentage of variance that can be explained by a given variable.

The value of power is influenced by the alpha level,sample size,and effect size.

A researcher obtains z = 1.45 for a one-sample z test.What is the decision for this test at a .05 level of significance?

Which of the following is not one of the four steps to hypothesis testing?

Given the following values: $\mu$ = 6.0,M = 7.6,n = 36, $\sigma$ = 6,conduct a one-sample z test at a .05 level of significance.For a one-tailed test,upper-tail critical,what is the decision?

The power of the decision-making process is

A researcher reports that scores were higher than the mean in the population,z = 1.60,p = .05 (d = 0.14).If this was a test at a .05 level of significance,then what value must be incorrectly reported?

One-tailed tests will rarely,if ever,result in decisions that are different from two-tailed tests in hypothesis testing.

A researcher obtains z = 2.04 for a one-sample z test.What is the decision for this test at a .05 level of significance?

A researcher reports the following result for a one-sample z test at a .05 level of significance: z = 1.88,p = .06 (d = 0.25).Is this result significant?

Which of the following best describes the p value.

Introduction to Statistics

Summarizing Data: Frequency Distributions in Tables and Graphs

Summarizing Data: Central Tendency

Summarizing Data: Variability

Probability

Probability, normal Distributions, and Z Scores

Probability and Sampling Distributions

Testing Means: One-Sample and Two-Independent-Sample T Tests

Testing Means: Truehe Related-Samples T Test

Estimation and Confidence Intervals

Analysis of Variance: One-Way Between-Subjects Design

Analysis of Variance: One-Way Within-Subjects Repeated-Measuresdesign

Analysis of Variance: Two-Way Between-Subjects Factorial Design

Correlation

Linear Regression and Multiple Regression

Nonparametric Tests: Chi-Square Tests

Nonparametric Tests: Tests for Ordinal Data

Filters

Exam 8: Hypothesis Testing: Significance,effect Size,and Power

The z statistic is a z transformation for a distribution of sample means.

A professor gives an exam in which the mean score is 78 points.She gives another exam to test whether or not scores change.In this example,the null hypothesis is

A researcher obtains z = 1.80 for a one-sample z test.What is the decision for this test at a .05 level of significance?

The probability of correctly rejecting a false null hypothesis is called the power of the decision-making process.

If a researcher obtains a null finding,then what is the decision?

What is the typical level of significance for a hypothesis test in behavioral research?

The first step to hypothesis testing requires that a researcher

Which of the following statements regarding the null hypothesis is true?

______ allows researchers to describe (1)how far mean scores have shifted in the population or (2)the percentage of variance that can be explained by a given variable.

The value of power is influenced by the alpha level,sample size,and effect size.

A researcher obtains z = 1.45 for a one-sample z test.What is the decision for this test at a .05 level of significance?

Which of the following is not one of the four steps to hypothesis testing?

Given the following values: μ\muμ = 6.0,M = 7.6,n = 36, σ\sigmaσ = 6,conduct a one-sample z test at a .05 level of significance.For a one-tailed test,upper-tail critical,what is the decision?

The power of the decision-making process is

A researcher reports that scores were higher than the mean in the population,z = 1.60,p = .05 (d = 0.14).If this was a test at a .05 level of significance,then what value must be incorrectly reported?

One-tailed tests will rarely,if ever,result in decisions that are different from two-tailed tests in hypothesis testing.

A researcher obtains z = 2.04 for a one-sample z test.What is the decision for this test at a .05 level of significance?

A researcher reports the following result for a one-sample z test at a .05 level of significance: z = 1.88,p = .06 (d = 0.25).Is this result significant?

Which of the following best describes the p value.

Introduction to Statistics

Summarizing Data: Frequency Distributions in Tables and Graphs

Summarizing Data: Central Tendency

Summarizing Data: Variability

Probability

Probability, normal Distributions, and Z Scores

Probability and Sampling Distributions

Testing Means: One-Sample and Two-Independent-Sample T Tests

Testing Means: Truehe Related-Samples T Test

Estimation and Confidence Intervals

Analysis of Variance: One-Way Between-Subjects Design

Analysis of Variance: One-Way Within-Subjects Repeated-Measuresdesign

Analysis of Variance: Two-Way Between-Subjects Factorial Design

Correlation

Linear Regression and Multiple Regression

Nonparametric Tests: Chi-Square Tests

Nonparametric Tests: Tests for Ordinal Data

Filters

Given the following values: $\mu$ = 6.0,M = 7.6,n = 36, $\sigma$ = 6,conduct a one-sample z test at a .05 level of significance.For a one-tailed test,upper-tail critical,what is the decision?