Question 1

Eta2 is

Accepted Answer

A) the proportion of unexplained variance relative to the total variance. 
B) the proportion of error variance relative to the total variance. 
C) the proportion of explained variance relative to the total variance. 
D) the total amount of variability in the independent variable. 
A) the proportion of unexplained variance relative to the total variance. 
B) the proportion of error variance relative to the total variance. 
C) the proportion of explained variance relative to the total variance. 
D) the total amount of variability in the independent variable.

Question 2

If a mean difference is 5,the estimated standard error of a mean difference is 4 and the nondirectional critical value of t for an alpha level of 0.05 is 2,what is the 95% confidence interval for the mean difference

Accepted Answer

A) 1 to 9 
B) 3 to 7 
C) -3 to 13 
D) -1 to 11 
A) 1 to 9 
B) 3 to 7 
C) -3 to 13 
D) -1 to 11

Question 3

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

Accepted Answer

strength o

Question 4

Like the standard error of the mean,the standard error of the difference is positively skewed.

Accepted Answer

A) True 
 B)False

Question 5

If the researcher suspects that the strength of the relationship between two variables in the population is .20,what sample size should she use per group in a study involving two independent groups and an alpha level of .05,nondirectional test,in order to achieve a power of .75?

Accepted Answer

A) 11 
B) 13 
C) 15 
D) 17 
A) 11 
B) 13 
C) 15 
D) 17

Question 6

By pooling the variance estimates from the two populations,we increase the _____ on which the estimate of ó2 is based and thereby obtain a better estimate.

Accepted Answer

A) degrees of freedom 
B) power 
C) population size 
D) standard error 
A) degrees of freedom 
B) power 
C) population size 
D) standard error

Question 7

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 8

Unexplained error or variance may be due to_________.

Accepted Answer

disturbanc

Question 9

When the observed t value is larger than the positive critical t value or smaller than the negative critical t value,this suggests that the observed mean difference can be attributed to sampling error.

Accepted Answer

A) True 
 B)False

Eta² is

If a mean difference is 5,the estimated standard error of a mean difference is 4 and the nondirectional critical value of t for an alpha level of 0.05 is 2,what is the 95% confidence interval for the mean difference

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

Like the standard error of the mean,the standard error of the difference is positively skewed.

If the researcher suspects that the strength of the relationship between two variables in the population is .20,what sample size should she use per group in a study involving two independent groups and an alpha level of .05,nondirectional test,in order to achieve a power of .75?

By pooling the variance estimates from the two populations,we increase the _____ on which the estimate of ó² is based and thereby obtain a better estimate.

Unexplained error or variance may be due to_________.

When the observed t value is larger than the positive critical t value or smaller than the negative critical t value,this suggests that the observed mean difference can be attributed to sampling error.

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

Eta2 is

If a mean difference is 5,the estimated standard error of a mean difference is 4 and the nondirectional critical value of t for an alpha level of 0.05 is 2,what is the 95% confidence interval for the mean difference

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

Like the standard error of the mean,the standard error of the difference is positively skewed.

If the researcher suspects that the strength of the relationship between two variables in the population is .20,what sample size should she use per group in a study involving two independent groups and an alpha level of .05,nondirectional test,in order to achieve a power of .75?

By pooling the variance estimates from the two populations,we increase the _____ on which the estimate of ó2 is based and thereby obtain a better estimate.

Unexplained error or variance may be due to_________.

When the observed t value is larger than the positive critical t value or smaller than the negative critical t value,this suggests that the observed mean difference can be attributed to sampling error.

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

Eta² is

By pooling the variance estimates from the two populations,we increase the _____ on which the estimate of ó² is based and thereby obtain a better estimate.