Question 1

The standard error of the difference becomes smaller as the difference between the sample means decreases and the variability of scores in the populations increases.

Accepted Answer

A) True 
 B)False

Question 2

The null hypothesis for an independent groups t test states that _____.

Accepted Answer

A) the population mean scores for each level of the independent variable are the same 
B) the two groups have different population means on the dependent variable 
C) the independent and dependent variables are related 
D) the population variances are the same 
A) the population mean scores for each level of the independent variable are the same 
B) the two groups have different population means on the dependent variable 
C) the independent and dependent variables are related 
D) the population variances are the same

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.  
What is the 95% confidence intervals for Dr.Johnson's study?

Accepted Answer

A) 5.78 to 15.72 
B) 5.99 to 15.52 
C) 6.78 to 17.78 
D) None of these 
A) 5.78 to 15.72 
B) 5.99 to 15.52 
C) 6.78 to 17.78 
D) None of these

Question 4

Treatment effects are defined as the difference between a given group mean and the grand mean.

Accepted Answer

A) True 
 B)False

Question 5

The independent groups t test assumes that the two population variances are unequal,or heterogeneous.

Accepted Answer

A) True 
 B)False

Question 6

When the independent variable has more than two levels which of the following statistical techniques may be used to investigate the relationship between the independent and dependent variables?

Accepted Answer

A) a one-sample t test 
B) a one sample z test 
C) an independent-groups t test 
D) none of these 
A) a one-sample t test 
B) a one sample z test 
C) an independent-groups t test 
D) none of these

Question 7

The _____ represents the total amount of _____ that exists in the data.

Accepted Answer

A) sum of squares total;error 
B) sum of squares error;variability 
C) sum of squares total;variability 
D) none of these 
A) sum of squares total;error 
B) sum of squares error;variability 
C) sum of squares total;variability 
D) none of these

Question 8

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.  
What is the strength of the relationship?

Accepted Answer

A) .75 
B) .72 
C) .67 
D) None of these 
A) .75 
B) .72 
C) .67 
D) None of these

Question 9

The standard error of the difference between two independent means is influenced by _____.

Accepted Answer

A) the sample size of both groups 
B) population variance of both groups 
C) both a and b 
D) none of these 
A) the sample size of both groups 
B) population variance of both groups 
C) both a and b 
D) none of these

Question 10

The_______tells you how much variance can be explained by the affect independent variable had on the dependent variable.

Accepted Answer

strength o

Question 11

The standard deviation of the sampling distribution of the differences between 2 means is referred to as_________.

Accepted Answer

the standa

Question 12

SSEXPLAINED represents

Accepted Answer

A) the total amount of variability that exists in the data when the scores for both groups are combined. 
B) the variability associated with the independent variable. 
C) the variability associated with factors other than the independent variable. 
D) the variability associated with the dependent variable. 
A) the total amount of variability that exists in the data when the scores for both groups are combined. 
B) the variability associated with the independent variable. 
C) the variability associated with factors other than the independent variable. 
D) the variability associated with the dependent variable.

Question 13

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 14

The measure of the strength of the relationship between the independent and dependent variables in the "cold/warm environment" data is ____.

Accepted Answer

A) 2.6672/(2.6672 + 16) 
B) 2.1202/(2.1202 + 16) 
C) .05 
D) 2.6672/2.667 + 18 
A) 2.6672/(2.6672 + 16) 
B) 2.1202/(2.1202 + 16) 
C) .05 
D) 2.6672/2.667 + 18

Question 15

The 95% confidence interval including the upper and lower limits,contains the_______.

Accepted Answer

true popul

Question 16

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.  
Is it possible that Dr.Johnson has_____.

Accepted Answer

A) Type I error 
B) sampling error 
C) Type II error 
D) Both a & b 
E) All of these 
A) Type I error 
B) sampling error 
C) Type II error 
D) Both a & b 
E) All of these

Question 17

The t statistic approximately follows a t distribution when (1)the samples are independently and randomly selected from their respective populations, (2)the scores in each population are normally distributed,and (3)the scores in the two populations have equal variances.

Accepted Answer

A) True 
 B)False

Question 18

The independent samples t test is reasonably robust to violations against which assumptions?

Accepted Answer

A) independent and random selection of both samples from their respective populations 
B) scores in each population are normally distributed 
C) scores in the two populations have equal variances 
D) both a and b 
E) both b and c 
A) independent and random selection of both samples from their respective populations 
B) scores in each population are normally distributed 
C) scores in the two populations have equal variances 
D) both a and b 
E) both b and c

Question 19

A non-directional alternative hypothesis is written as _____.

Accepted Answer

A) H0: ì1 = ì2. 
B) H1: ì1 > ì2 
C) H0: ì1 = ì2 
D) H1: ì1   
ì2 
A) H0: ì1 = ì2. 
B) H1: ì1 > ì2 
C) H0: ì1 = ì2 
D) H1: ì1   
ì2

Question 20

The nature of the relationship is determined by_____

Accepted Answer

A) examining the sample means 
B) examining the t-value 
C) examining the confidence intervals 
D) All of these 
A) examining the sample means 
B) examining the t-value 
C) examining the confidence intervals 
D) All of these

The standard error of the difference becomes smaller as the difference between the sample means decreases and the variability of scores in the populations increases.

The null hypothesis for an independent groups t test states that _____.

Treatment effects are defined as the difference between a given group mean and the grand mean.

The independent groups t test assumes that the two population variances are unequal,or heterogeneous.

When the independent variable has more than two levels which of the following statistical techniques may be used to investigate the relationship between the independent and dependent variables?

The _ represents the total amount of _ that exists in the data.

The standard error of the difference between two independent means is influenced by _____.

The_______tells you how much variance can be explained by the affect independent variable had on the dependent variable.

The standard deviation of the sampling distribution of the differences between 2 means is referred to as_________.

SS_EXPLAINED represents

A formula used to calculate eta² is ____.

The measure of the strength of the relationship between the independent and dependent variables in the "cold/warm environment" data is ____.

The 95% confidence interval including the upper and lower limits,contains the_______.

The t statistic approximately follows a t distribution when (1)the samples are independently and randomly selected from their respective populations, (2)the scores in each population are normally distributed,and (3)the scores in the two populations have equal variances.

The independent samples t test is reasonably robust to violations against which assumptions?

A non-directional alternative hypothesis is written as _____.

The nature of the relationship is determined by_____

Introduction and Mathematical Preliminaries

Frequency and Probability Distributions

Measures of Central Tendency and Variability

Percentiles,percentile Ranks,standard Scores,and the Normal Distribution

Pearson Correlation and Regression: Descriptive Aspects

Probability

Estimation and Sampling Distributions

Hypothesis Testing: Inferences About a Single Mean

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 standard error of the difference becomes smaller as the difference between the sample means decreases and the variability of scores in the populations increases.

The null hypothesis for an independent groups t test states that _____.

Treatment effects are defined as the difference between a given group mean and the grand mean.

The independent groups t test assumes that the two population variances are unequal,or heterogeneous.

When the independent variable has more than two levels which of the following statistical techniques may be used to investigate the relationship between the independent and dependent variables?

The _____ represents the total amount of _____ that exists in the data.

The standard error of the difference between two independent means is influenced by _____.

The_______tells you how much variance can be explained by the affect independent variable had on the dependent variable.

The standard deviation of the sampling distribution of the differences between 2 means is referred to as_________.

SSEXPLAINED represents

A formula used to calculate eta2 is ____.

The measure of the strength of the relationship between the independent and dependent variables in the "cold/warm environment" data is ____.

The 95% confidence interval including the upper and lower limits,contains the_______.

The t statistic approximately follows a t distribution when (1)the samples are independently and randomly selected from their respective populations, (2)the scores in each population are normally distributed,and (3)the scores in the two populations have equal variances.

The independent samples t test is reasonably robust to violations against which assumptions?

A non-directional alternative hypothesis is written as _____.

The nature of the relationship is determined by_____

Introduction and Mathematical Preliminaries

Frequency and Probability Distributions

Measures of Central Tendency and Variability

Percentiles,percentile Ranks,standard Scores,and the Normal Distribution

Pearson Correlation and Regression: Descriptive Aspects

Probability

Estimation and Sampling Distributions

Hypothesis Testing: Inferences About a Single Mean

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

The _ represents the total amount of _ that exists in the data.

SS_EXPLAINED represents

A formula used to calculate eta² is ____.