Question 1

Normality,random sampling,and independence are all assumptions for the one-sample t test.

Accepted Answer

A) True 
 B)False

Question 2

A researcher records the number of distracters (such as noises)that preschool-aged children ignore while watching a popular Sunday morning cartoon show.Assuming that the population variance is unknown,what type of t test is appropriate for this study?

Accepted Answer

A) one-sample t test 
B) two-independent sample t test 
C) There is not enough information to answer this question. 
A) one-sample t test 
B) two-independent sample t test 
C) There is not enough information to answer this question.

Question 3

A researcher finds that the mean difference in productivity between employees working the morning shift (n = 16)and the night shift (n = 10)is 5.0 units,and the estimated standard error for the difference is 2.7 units.If the null hypothesis states that there is no difference in productivity,then is this result significant at a .05 level of significance?

Accepted Answer

A) Yes,this result is significant. 
B) No,this result is not significant. 
C) There is not enough information to answer this question. 
A) Yes,this result is significant. 
B) No,this result is not significant. 
C) There is not enough information to answer this question.

Question 4

Effect size measures are an estimate of the size of an effect in a population.

Accepted Answer

A) True 
 B)False

Question 5

A researcher reports a significant effect with t(14)= 3.24.Compute eta-squared for this result.

Accepted Answer

A)    = 0.43 (large effect size) 
B)    = 0.43 (medium effect size) 
C)    = 0.37 (large effect size) 
D)    = 0.37 (medium effect size) 
A)    = 0.43 (large effect size) 
B)    = 0.43 (medium effect size) 
C)    = 0.37 (large effect size) 
D)    = 0.37 (medium effect size)

Question 6

You read about a study testing whether night shift workers sleep the recommended 8 hours per day.Assuming that the population variance of sleep (per day)is unknown,what type of t test is appropriate for this study?

Accepted Answer

A) one-sample t test 
B) two-independent sample t test 
C) There is not enough information to answer this question. 
A) one-sample t test 
B) two-independent sample t test 
C) There is not enough information to answer this question.

Question 7

A one-sample t test will be t = 0 when the mean difference is equal to 0.

Accepted Answer

A) True 
 B)False

Question 8

A researcher reports that the effectiveness of a new marketing campaign significantly increased sales compared with the previous campaign strategy,t(49)= 2.562,p < .05.Use eta-squared to interpret the effect size for this result.

Accepted Answer

A) 12% of the variability in marketing effectiveness can be accounted for by the new marketing strategy. 
B) 12% of the standard error can be accounted for by the effectiveness of the marketing strategy. 
C) Marketing effectiveness shifted 0.12 standard deviations above the mean in the population. 
D) both A and B are correct 
A) 12% of the variability in marketing effectiveness can be accounted for by the new marketing strategy. 
B) 12% of the standard error can be accounted for by the effectiveness of the marketing strategy. 
C) Marketing effectiveness shifted 0.12 standard deviations above the mean in the population. 
D) both A and B are correct

Question 9

To compute a one-sample t test,a researcher has to know many values.Which of the following is NOT a value that the researcher must know to compute this test?

Accepted Answer

A) The estimated standard error must be known. 
B) The population variance must be known. 
C) The sample size must be known. 
D) The sample mean and sample variance must be known. 
A) The estimated standard error must be known. 
B) The population variance must be known. 
C) The sample size must be known. 
D) The sample mean and sample variance must be known.

Question 10

A researcher reports the following result for a lower-tail critical test at a .05 level of significance,t(40)= 3.212,and accurately concludes that this result is significant.

Accepted Answer

A) True 
 B)False

Question 11

A researcher conducts two t tests.Test 1 is a one-tailed test with a smaller sample size at a .05 level of significance.Test 2 is a one-tailed test with a larger sample size at a .05 level of significance.What do you know about the critical values for each test?

Accepted Answer

A) Test 1 is associated with smaller critical values. 
B) Test 2 is associated with smaller critical values. 
C) Each test is associated with the same critical values. 
D) It depends;there is not enough information to answer this question. 
A) Test 1 is associated with smaller critical values. 
B) Test 2 is associated with smaller critical values. 
C) Each test is associated with the same critical values. 
D) It depends;there is not enough information to answer this question.

Question 12

A professor teaches a certain section of material using a lot of examples with sports and cars to illustrate.He is concerned that this may have biased his instruction to favor male students.To test this,he measures exam grades from this section of material among women (n = 10)and men (n = 10).The mean score in the male group was 84±4.0 (M±SD);in the female group,it was 78±8.0 (M±SD)points.If the null hypothesis is that there is no difference in exam scores,then test the null hypothesis at a .05 level of significance.

Accepted Answer

A) Exam scores were significantly higher in the male group,t(18)= 2.83,p  .05. 
C) Exam scores were significantly higher in the male group,t(18)= 2.12,p  .05. 
A) Exam scores were significantly higher in the male group,t(18)= 2.83,p  .05. 
C) Exam scores were significantly higher in the male group,t(18)= 2.12,p  .05.

Question 13

The p value is reported with the test statistic of a one-sample and a two-independent sample t test using APA format.

Accepted Answer

A) True 
 B)False

Question 14

A researcher must know the population variance in order to compute a t test.

Accepted Answer

A) True 
 B)False

Question 15

The mean crying time of infants during naptime at a local preschool is 12 minutes.The school implements a new naptime routine in a sample of 25 infants and records an average crying time of 8±4.6 (M±SD)minutes.Test whether this new naptime routine reduced crying time at a .05 level of significance.

Accepted Answer

A) The new naptime routine significantly reduced crying time,t(24)= -4.35,p  .05. 
D) The new naptime routine significantly reduce crying time,t(24)= 0.92,p < .05. 
A) The new naptime routine significantly reduced crying time,t(24)= -4.35,p  .05. 
D) The new naptime routine significantly reduce crying time,t(24)= 0.92,p < .05.

Question 16

As a requirement for the t test,researchers compute any type of t test with samples selected from populations in which

Accepted Answer

A) the population variance is known 
B) the population size is very large 
C) the population variance is unknown 
D) the population is the same size as the sample 
A) the population variance is known 
B) the population size is very large 
C) the population variance is unknown 
D) the population is the same size as the sample

Question 17

A two-independent sample t test is used when the same participants are observed in each of two groups.

Accepted Answer

A) True 
 B)False

Question 18

Is a one-sample t test reported differently for one-tailed and two-tailed tests?

Accepted Answer

A) No,the same values are reported. 
B) It depends on whether the results were significant. 
C) Yes,only significant results for a two-tailed test are reported. 
D) It can be reported differently when the effect size is large. 
A) No,the same values are reported. 
B) It depends on whether the results were significant. 
C) Yes,only significant results for a two-tailed test are reported. 
D) It can be reported differently when the effect size is large.

Question 19

The critical values are reported with the test statistic of a one-sample and a two-independent sample t test using APA format.

Accepted Answer

A) True 
 B)False

Question 20

When the proportion of variance explained by some treatment is larger than 0.25,we conclude that there is a large effect in the population.

Accepted Answer

A) True 
 B)False

Normality,random sampling,and independence are all assumptions for the one-sample t test.

A researcher records the number of distracters (such as noises)that preschool-aged children ignore while watching a popular Sunday morning cartoon show.Assuming that the population variance is unknown,what type of t test is appropriate for this study?

Effect size measures are an estimate of the size of an effect in a population.

A researcher reports a significant effect with t(14)= 3.24.Compute eta-squared for this result.

You read about a study testing whether night shift workers sleep the recommended 8 hours per day.Assuming that the population variance of sleep (per day)is unknown,what type of t test is appropriate for this study?

A one-sample t test will be t = 0 when the mean difference is equal to 0.

A researcher reports that the effectiveness of a new marketing campaign significantly increased sales compared with the previous campaign strategy,t(49)= 2.562,p < .05.Use eta-squared to interpret the effect size for this result.

To compute a one-sample t test,a researcher has to know many values.Which of the following is NOT a value that the researcher must know to compute this test?

A researcher reports the following result for a lower-tail critical test at a .05 level of significance,t(40)= 3.212,and accurately concludes that this result is significant.

A researcher conducts two t tests.Test 1 is a one-tailed test with a smaller sample size at a .05 level of significance.Test 2 is a one-tailed test with a larger sample size at a .05 level of significance.What do you know about the critical values for each test?

The p value is reported with the test statistic of a one-sample and a two-independent sample t test using APA format.

A researcher must know the population variance in order to compute a t test.

As a requirement for the t test,researchers compute any type of t test with samples selected from populations in which

A two-independent sample t test is used when the same participants are observed in each of two groups.

Is a one-sample t test reported differently for one-tailed and two-tailed tests?

The critical values are reported with the test statistic of a one-sample and a two-independent sample t test using APA format.

When the proportion of variance explained by some treatment is larger than 0.25,we conclude that there is a large effect in the population.

Introduction to Statistics

Summarizing Data: Frequency Distributions in

Summarizing Data: Central Tendency

Summarizing Data: Variability

Probability, Normal Distributions, and Z Scores

Characteristics of the Sample Mean

Hypothesis Testing: Significance, Effect Size, and Power

Testing Means: One-Sample T Test With Confidence Intervals

Testing Means: Related-Samples T Test With Confidence Intervals

One-Way Analysis of Variance: Between- Subjects and Within- Subjects Repeated- Measures Designs

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

Correlation and Linear Regression

Chi-Square Tests: Goodness of Fit and the Test for Independence

Nonparametric Tests for Ordinal Data: Understanding and Interpretation

Chi-Square Tests: Goodness-of-Fit and Independence

Understanding Regression Analysis

Understanding Correlation Coefficients in Statistical Analysis

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Exam 9: Testing Means: Two- Independent-Sample T Test With Confidence Intervals

Normality,random sampling,and independence are all assumptions for the one-sample t test.

A researcher records the number of distracters (such as noises)that preschool-aged children ignore while watching a popular Sunday morning cartoon show.Assuming that the population variance is unknown,what type of t test is appropriate for this study?

Effect size measures are an estimate of the size of an effect in a population.

A researcher reports a significant effect with t(14)= 3.24.Compute eta-squared for this result.

You read about a study testing whether night shift workers sleep the recommended 8 hours per day.Assuming that the population variance of sleep (per day)is unknown,what type of t test is appropriate for this study?

A one-sample t test will be t = 0 when the mean difference is equal to 0.

A researcher reports that the effectiveness of a new marketing campaign significantly increased sales compared with the previous campaign strategy,t(49)= 2.562,p < .05.Use eta-squared to interpret the effect size for this result.

To compute a one-sample t test,a researcher has to know many values.Which of the following is NOT a value that the researcher must know to compute this test?

A researcher reports the following result for a lower-tail critical test at a .05 level of significance,t(40)= 3.212,and accurately concludes that this result is significant.

A researcher conducts two t tests.Test 1 is a one-tailed test with a smaller sample size at a .05 level of significance.Test 2 is a one-tailed test with a larger sample size at a .05 level of significance.What do you know about the critical values for each test?

The p value is reported with the test statistic of a one-sample and a two-independent sample t test using APA format.

A researcher must know the population variance in order to compute a t test.

As a requirement for the t test,researchers compute any type of t test with samples selected from populations in which

A two-independent sample t test is used when the same participants are observed in each of two groups.

Is a one-sample t test reported differently for one-tailed and two-tailed tests?

The critical values are reported with the test statistic of a one-sample and a two-independent sample t test using APA format.

When the proportion of variance explained by some treatment is larger than 0.25,we conclude that there is a large effect in the population.

Introduction to Statistics

Summarizing Data: Frequency Distributions in

Summarizing Data: Central Tendency

Summarizing Data: Variability

Probability, Normal Distributions, and Z Scores

Characteristics of the Sample Mean

Hypothesis Testing: Significance, Effect Size, and Power

Testing Means: One-Sample T Test With Confidence Intervals

Testing Means: Related-Samples T Test With Confidence Intervals

One-Way Analysis of Variance: Between- Subjects and Within- Subjects Repeated- Measures Designs

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

Correlation and Linear Regression

Chi-Square Tests: Goodness of Fit and the Test for Independence

Nonparametric Tests for Ordinal Data: Understanding and Interpretation

Chi-Square Tests: Goodness-of-Fit and Independence

Understanding Regression Analysis

Understanding Correlation Coefficients in Statistical Analysis

Filters