Question 1

The 95% confidence intervals are_____reported in APA results sections.

Accepted Answer

A) never 
B) usually 
C) sometimes 
D) None of these 
A) never 
B) usually 
C) sometimes 
D) None of these

Question 2

The amount of sampling error is determined by_____.

Accepted Answer

A) Standard error of the difference 
B) Standard error of the mean 
C) Standard scores or z-scores 
D) None of these 
A) Standard error of the difference 
B) Standard error of the mean 
C) Standard scores or z-scores 
D) None of these

Question 3

Dr.Johnson is studying the effects of aspirin on heart rate.He believes that aspirin will lower heart rate.He has 2 groups the treatment group receives 80mg of aspirin for a week (n=4)the control group received a placebo (n=4)and their heart rates are compared.Below is his data in which heart rate is beats per minute.He sets his alpha level at 0.05 and uses a directional test.  
Can you reject the null hypothesis and concluded that aspirin lowers heart rate?

Accepted Answer

A) Yes,since the calculated t is greater than the table t 
B) No,since the calculated t is greater than the table t 
C) more information is necessary 
D) None of these 
A) Yes,since the calculated t is greater than the table t 
B) No,since the calculated t is greater than the table t 
C) more information is necessary 
D) None of these

Question 4

If the sample sizes are not equal,then the pooled variance estimate should be calculated ____.

Accepted Answer

A) using the unweighted mean of the variances 
B) using a weighted mean of the variances 
C) by reducing the size of one group to equal the size of the other group 
A) using the unweighted mean of the variances 
B) using a weighted mean of the variances 
C) by reducing the size of one group to equal the size of the other group

Question 5

A formula used to calculate eta2 is ____.

Accepted Answer

A) t 2t 2 - 1 
B) t 2/(t 2 + df ) 
C) SSEXPLAINED /SSTOTAL 
D) both b and c 
A) t 2t 2 - 1 
B) t 2/(t 2 + df ) 
C) SSEXPLAINED /SSTOTAL 
D) both b and c

Question 6

Before a researcher decides what statistical test,and if an independent t-test is correct he/ she must determine_____.

Accepted Answer

A) The number of independent variables manipulated 
B) Scale of measurement of the dependent variable (quantitative vs.qualitative) 
C) Within or between subject design 
D) The number of subjects used 
E) All of these are correct 
A) The number of independent variables manipulated 
B) Scale of measurement of the dependent variable (quantitative vs.qualitative) 
C) Within or between subject design 
D) The number of subjects used 
E) All of these are correct

Question 7

Which of the following indices measures the strength of the relationship between the independent and dependent variables?

Accepted Answer

A) standard error of difference 
B) power 
C) eta2 
D) alpha 
A) standard error of difference 
B) power 
C) eta2 
D) alpha

Question 8

Typically,research in the behavioral sciences involves _____ values of eta-squared.

Accepted Answer

A) extremely large 
B) somewhat large 
C) moderate 
D) relatively small 
A) extremely large 
B) somewhat large 
C) moderate 
D) relatively small

Question 9

A physical therapist is interested in whether people with different bone structures will be affected differently by her new therapy program.She randomly chooses two groups of patients based on bone type: small-boned frame (XS)and large-boned frame (XL).Patients all had similar injuries.She measures the number of days each person takes to progress to a predetermined point.Here is the data:  
What is the estimated standard error of the difference?

Accepted Answer

A) 1.13 
B) 1.28 
C) 1.63 
D) 3.30 
A) 1.13 
B) 1.28 
C) 1.63 
D) 3.30

Question 10

The mean of a sampling distribution of the differences between two independent means

Accepted Answer

A) always equals zero 
B) always equals one 
C) always equals the difference between the sample means 
D) always equals the difference between the population means 
A) always equals zero 
B) always equals one 
C) always equals the difference between the sample means 
D) always equals the difference between the population means

Question 11

When sample sizes are small,power will tend to be __,everything else being equal.

Accepted Answer

A) low 
B) moderate 
C) high 
D) there is no affect 
A) low 
B) moderate 
C) high 
D) there is no affect

Question 12

In an independent groups t test,the null hypothesis is H0: ì1 = ì2.

Accepted Answer

A) True 
 B)False

Question 13

For the t test to be considered robust to violations of certain assumptions,the samples should be ____.

Accepted Answer

A) relatively large 
B) approximately equal 
C) both a and b 
D) none of these 
A) relatively large 
B) approximately equal 
C) both a and b 
D) none of these

Question 14

Explained variance is variability associated with (explained by)disturbance variables.

Accepted Answer

A) True 
 B)False

Question 15

If the researcher suspects that the strength of the relationship between two variables in the population is .45,what sample size should she use per group in a study involving two independent groups and an alpha level of .05,directional test,in order to achieve a power of .85?

Accepted Answer

A) 4 
B) 5 
C) 6 
A) 4 
B) 5 
C) 6

Question 16

In an APA results section and independent groups t-test is written as follows t(82)= 5.66,p<0.05.Based on this information were the groups significantly different?

Accepted Answer

A) yes,since p<0.05 
B) no,since p should be less than 0.01 to be significant 
C) there may be a type II error 
D) there may not be enough subjects 
A) yes,since p<0.05 
B) no,since p should be less than 0.01 to be significant 
C) there may be a type II error 
D) there may not be enough subjects

Question 17

A physical therapist is interested in whether people with different bone structures will be affected differently by her new therapy program.She randomly chooses two groups of patients based on bone type: small-boned frame (XS)and large-boned frame (XL).Patients all had similar injuries.She measures the number of days each person takes to progress to a predetermined point.Here is the data:  
What is the pooled variance estimate?

Accepted Answer

A) 0.70 
B) 1.13 
C) 2.13 
D) 4.54 
A) 0.70 
B) 1.13 
C) 2.13 
D) 4.54

Question 18

If the 95% confidence interval of a mean difference is -1 to 3,then the null hypothesis in the analysis was rejected.

Accepted Answer

A) True 
 B)False

Question 19

Which of the following assumptions applies to the independent groups t test?

Accepted Answer

A) The samples have been randomly drawn from their respective populations. 
B) The scores in each population are normally distributed. 
C) The variances of both populations are homogeneous. 
D) All of these 
A) The samples have been randomly drawn from their respective populations. 
B) The scores in each population are normally distributed. 
C) The variances of both populations are homogeneous. 
D) All of these

Question 20

The null hypothesis in the independent groups t test is that a population mean has a specific value,specified by the investigator.

Accepted Answer

A) True 
 B)False

The 95% confidence intervals are_____reported in APA results sections.

The amount of sampling error is determined by_____.

If the sample sizes are not equal,then the pooled variance estimate should be calculated ____.

A formula used to calculate eta² is ____.

Before a researcher decides what statistical test,and if an independent t-test is correct he/ she must determine_____.

Which of the following indices measures the strength of the relationship between the independent and dependent variables?

Typically,research in the behavioral sciences involves _____ values of eta-squared.

The mean of a sampling distribution of the differences between two independent means

When sample sizes are small,power will tend to be __,everything else being equal.

In an independent groups t test,the null hypothesis is H₀: ì₁ = ì₂.

For the t test to be considered robust to violations of certain assumptions,the samples should be ____.

Explained variance is variability associated with (explained by)disturbance variables.

If the researcher suspects that the strength of the relationship between two variables in the population is .45,what sample size should she use per group in a study involving two independent groups and an alpha level of .05,directional test,in order to achieve a power of .85?

In an APA results section and independent groups t-test is written as follows t(82)= 5.66,p<0.05.Based on this information were the groups significantly different?

If the 95% confidence interval of a mean difference is -1 to 3,then the null hypothesis in the analysis was rejected.

Which of the following assumptions applies to the independent groups t test?

The null hypothesis in the independent groups t test is that a population mean has a specific value,specified by the investigator.

Introduction and Mathematical Preliminaries

Frequency and Probability Distributions

Percentiles percentile Ranks standard Scores and the Normal Distribution

Pearson Correlation and Regression: Descriptive Aspects

Measures of Central Tendency and Variability

Estimation and Sampling Distributions

Hypothesis Testing: Inferences About a Single Mean

Probability

Principles of Research Design and Statistical Preliminaries for Analyzing Bivariate Relationships

Correlated Groups T-Test

One-Way Repeated Measures Analysis of Variance

Pearson Correlation and Regression: Inferential Aspects

Chi-Square Test

Nonparametric Statistics

Two-Way Between-Subjects Analysis of Variance

Overview and Extension: Statistical Tests for More Complex Designs

Filters

Exam 10: Independent Groups T -Test

The 95% confidence intervals are_____reported in APA results sections.

The amount of sampling error is determined by_____.

If the sample sizes are not equal,then the pooled variance estimate should be calculated ____.

A formula used to calculate eta2 is ____.

Before a researcher decides what statistical test,and if an independent t-test is correct he/ she must determine_____.

Which of the following indices measures the strength of the relationship between the independent and dependent variables?

Typically,research in the behavioral sciences involves _____ values of eta-squared.

The mean of a sampling distribution of the differences between two independent means

When sample sizes are small,power will tend to be __,everything else being equal.

In an independent groups t test,the null hypothesis is H0: ì1 = ì2.

For the t test to be considered robust to violations of certain assumptions,the samples should be ____.

Explained variance is variability associated with (explained by)disturbance variables.

If the researcher suspects that the strength of the relationship between two variables in the population is .45,what sample size should she use per group in a study involving two independent groups and an alpha level of .05,directional test,in order to achieve a power of .85?

In an APA results section and independent groups t-test is written as follows t(82)= 5.66,p<0.05.Based on this information were the groups significantly different?

If the 95% confidence interval of a mean difference is -1 to 3,then the null hypothesis in the analysis was rejected.

Which of the following assumptions applies to the independent groups t test?

The null hypothesis in the independent groups t test is that a population mean has a specific value,specified by the investigator.

Introduction and Mathematical Preliminaries

Frequency and Probability Distributions

Percentiles percentile Ranks standard Scores and the Normal Distribution

Pearson Correlation and Regression: Descriptive Aspects

Measures of Central Tendency and Variability

Estimation and Sampling Distributions

Hypothesis Testing: Inferences About a Single Mean

Probability

Principles of Research Design and Statistical Preliminaries for Analyzing Bivariate Relationships

Correlated Groups T-Test

One-Way Repeated Measures Analysis of Variance

Pearson Correlation and Regression: Inferential Aspects

Chi-Square Test

Nonparametric Statistics

Two-Way Between-Subjects Analysis of Variance

Overview and Extension: Statistical Tests for More Complex Designs

Filters

A formula used to calculate eta² is ____.

In an independent groups t test,the null hypothesis is H₀: ì₁ = ì₂.