Question 1

By convention, the mean of the sampling distribution equals

Accepted Answer

A) 0. 
B) the mean of the sample. 
C) 1. 
D) -1. 
A) 0. 
B) the mean of the sample. 
C) 1. 
D) -1. A

Question 2

To determine the extent to which the conditions of the independent variable determine dependent scores, we should compute

Accepted Answer

A) the effect size. 
B) an independent-samples t-test. 
C) a related-samples t-test. 
D) the standard error of the difference between means. 
A) the effect size. 
B) an independent-samples t-test. 
C) a related-samples t-test. 
D) the standard error of the difference between means. A

Question 3

If a researcher predicts the experimental treatment $\left(\bar{X}_{1}-\bar{X}_{2}<0\right)$ $\bar{X}_{2}$ will produce an increase in an independent-samples t-test
, how will the null hypothesis be stated?

Accepted Answer

$H_{0}: \mu_{1}-\mu_{2} \geq 0$

Question 4

If a researcher predicts the experimental treatment $\left(\bar{X}_{1}-\bar{X}_{2}>0\right)$ $\bar{X}_{2}$ will produce an decrease in an independent-samples t-test
, how will the alternative hypothesis be stated?

Accepted Answer

The answer of If a researcher predicts the experimental treatment...

Question 5

What are the degrees of freedom for an independent-samples t-test using two samples with n = 20 in each sample?

Accepted Answer

The answer of What are the degrees of freedom for...

Question 6

What can we conclude if we reject the null hypothesis in an independent-samples t-test?

Accepted Answer

A) It is likely that sampling error accounted for the differences between the sample means. 
B) It is likely that the sample means came from the same population. 
C) The difference between our sample means is unlikely to be representing zero difference in the population means. 
D) The difference between our sample means is merely a poor representation of zero difference in the population means. 
A) It is likely that sampling error accounted for the differences between the sample means. 
B) It is likely that the sample means came from the same population. 
C) The difference between our sample means is unlikely to be representing zero difference in the population means. 
D) The difference between our sample means is merely a poor representation of zero difference in the population means.

Question 7

The freshmen competed with the sophomores to see who could raise the most money by recycling.The appropriate design for testing the significance of the difference between the means is

Accepted Answer

A) related-samples t-test. 
B) independent-samples t-test. 
C) one-sample t-test. 
D) z-test. 
A) related-samples t-test. 
B) independent-samples t-test. 
C) one-sample t-test. 
D) z-test.

Question 8

What is the standard error of the difference?

Accepted Answer

A) The standard deviation of the sample means 
B) The standard deviation of the sampling distribution of the mean 
C) The standard deviation of the sampling distribution of differences between means 
D) The pooled standard deviation from the populations from which the samples are drawn 
A) The standard deviation of the sample means 
B) The standard deviation of the sampling distribution of the mean 
C) The standard deviation of the sampling distribution of differences between means 
D) The pooled standard deviation from the populations from which the samples are drawn

Question 9

If a researcher predicts the experimental treatment $\left(\bar{X}_{1}-\bar{X}_{2}>0\right)$ $\bar{X}_{2}$ will produce a decrease in an independent-samples t-test
, how will the null hypothesis be stated?

Accepted Answer

The answer of If a researcher predicts the experimental treatment...

Question 10

If the variance for Sample 1 is 5 and the variance for Sample 2 is 3, where $n_{1}$ = 10 and $n_{2}$ = 12, what is $S \bar{X}_{1}-\bar{X}_{2}$ ?

Accepted Answer

The answer of If the variance for Sample 1 is...

Question 11

Suppose you want to do an independent-samples t-test where you have 60 subjects in one group and 53 in the other group.Are the unequal ns problematic?

Accepted Answer

No, equal participants in each

Question 12

Suppose a researcher assessed attitudes towards a certain brand of soda before and after conducting a taste test and noted the following results: $\begin{array}{ll}
\text { Pre } & \text { Post } \
5 & 7 \
4 & 9 \
3 & 4 \
5 & 10 \
4 & 4 \
5 & 4
\end{array}$ What is the mean difference?

Accepted Answer

A) -2 
B) -12 
C) 12 
D) 6 
A) -2 
B) -12 
C) 12 
D) 6

Question 13

In an experiment, the "proportion of variance accounted for" is also called the

Accepted Answer

A) effect size. 
B) error reduction coefficient. 
C) confidence interval. 
D) standard error of the difference between means. 
A) effect size. 
B) error reduction coefficient. 
C) confidence interval. 
D) standard error of the difference between means.

Question 14

A Cohen's d value of .5 would be viewed as indicative of a effect.

Accepted Answer

A) medium 
B) small 
C) large 
D) very large 
A) medium 
B) small 
C) large 
D) very large

Question 15

The sampling distribution of differences between means is the distribution of all possible

Accepted Answer

A) sample means. 
B) differences between two means. 
C) differences between two means when drawn from the raw score populations described by Ha. 
D) differences between two means when drawn from the raw score populations described by H0. 
A) sample means. 
B) differences between two means. 
C) differences between two means when drawn from the raw score populations described by Ha. 
D) differences between two means when drawn from the raw score populations described by H0.

Question 16

Suppose you measure the IQ of 14 subjects with short index fingers and the IQ of 14 subjects with long index fingers.You compute an independent-samples t-test, and the $t_{o b t}$ is 0.29, which is not statistically significant.What is the most appropriate conclusion?

Accepted Answer

We do not have convi

Question 17

In order to find the t-obtained for an independent t-test, which step is not required?

Accepted Answer

A) Set up the sampling distribution 
B) Compute the pooled variance 
C) Compute the standard error of the difference 
D) Determine the means of your groups 
A) Set up the sampling distribution 
B) Compute the pooled variance 
C) Compute the standard error of the difference 
D) Determine the means of your groups

Question 18

How many subjects participated in an independent-samples t-test if a researcher reports t20) = 3.68?

Accepted Answer

The answer of How many subjects participated in an independent-samples...

Question 19

An appropriate example of a repeated measures design would be

Accepted Answer

A) comparing individual attitudes about drinking before and after viewing a film on the topic. 
B) contrasting how the personalities of identical twins may differ. 
C) ascertaining whether a given sample is a good representative of a given population. 
D) comparing how men and women differ on memory tasks. 
A) comparing individual attitudes about drinking before and after viewing a film on the topic. 
B) contrasting how the personalities of identical twins may differ. 
C) ascertaining whether a given sample is a good representative of a given population. 
D) comparing how men and women differ on memory tasks.

Question 20

In a study involving stress among college students, a group of seniors are asked to complete a stress survey.After a two-hour seminar on relaxation methods, they are asked to complete the stress survey again.The appropriate design for testing the significance of the difference between the means is

Accepted Answer

A) related-samples t-test. 
B) independent-samples t-test. 
C) one-sample t-test. 
D) z-test. 
A) related-samples t-test. 
B) independent-samples t-test. 
C) one-sample t-test. 
D) z-test.

By convention, the mean of the sampling distribution equals

To determine the extent to which the conditions of the independent variable determine dependent scores, we should compute

If a researcher predicts the experimental treatment $\left(\bar{X}_{1}-\bar{X}_{2}<0\right)$ $\bar{X}_{2}$ will produce an increase in an independent-samples t-test , how will the null hypothesis be stated?

If a researcher predicts the experimental treatment $\left(\bar{X}_{1}-\bar{X}_{2}>0\right)$ $\bar{X}_{2}$ will produce an decrease in an independent-samples t-test , how will the alternative hypothesis be stated?

What are the degrees of freedom for an independent-samples t-test using two samples with n = 20 in each sample?

What can we conclude if we reject the null hypothesis in an independent-samples t-test?

The freshmen competed with the sophomores to see who could raise the most money by recycling.The appropriate design for testing the significance of the difference between the means is

What is the standard error of the difference?

If a researcher predicts the experimental treatment $\left(\bar{X}_{1}-\bar{X}_{2}>0\right)$ $\bar{X}_{2}$ will produce a decrease in an independent-samples t-test , how will the null hypothesis be stated?

If the variance for Sample 1 is 5 and the variance for Sample 2 is 3, where $n_{1}$ = 10 and $n_{2}$ = 12, what is $S \bar{X}_{1}-\bar{X}_{2}$ ?

Suppose you want to do an independent-samples t-test where you have 60 subjects in one group and 53 in the other group.Are the unequal ns problematic?

Suppose a researcher assessed attitudes towards a certain brand of soda before and after conducting a taste test and noted the following results: Pre Post 5 7 4 9 3 4 5 10 4 4 5 4 What is the mean difference?

In an experiment, the "proportion of variance accounted for" is also called the

A Cohen's d value of .5 would be viewed as indicative of a effect.

The sampling distribution of differences between means is the distribution of all possible

Suppose you measure the IQ of 14 subjects with short index fingers and the IQ of 14 subjects with long index fingers.You compute an independent-samples t-test, and the $t_{o b t}$ is 0.29, which is not statistically significant.What is the most appropriate conclusion?

In order to find the t-obtained for an independent t-test, which step is not required?

How many subjects participated in an independent-samples t-test if a researcher reports t20) = 3.68?

An appropriate example of a repeated measures design would be

In a study involving stress among college students, a group of seniors are asked to complete a stress survey.After a two-hour seminar on relaxation methods, they are asked to complete the stress survey again.The appropriate design for testing the significance of the difference between the means is

Introduction to Statistics and Research

Creating and Using Frequency Distributions

Summarizing Scores With Measures of Central Tendency

Summarizing Scores With Measures of Variability

Describing Data With Z-Scores and the Normal Curve

Using Probability to Make Decisions About Data

Overview of Statistical Hypothesis Testing: the Z-Test

Hypothesis Testing Using the One-Sample T-Test

Describing Relationships Using Correlation and Regression

Hypothesis Testing Using the One-Way Analysis of Variance

Understanding the Two-Way Analysis of Variance

Chi Square and Nonparametric Procedures

Filters

Exam 9: Hypothesis Testing Using the Two-Sample T-Test

By convention, the mean of the sampling distribution equals

To determine the extent to which the conditions of the independent variable determine dependent scores, we should compute

If a researcher predicts the experimental treatment (Xˉ1−Xˉ2<0)\left(\bar{X}_{1}-\bar{X}_{2}<0\right)(Xˉ1​−Xˉ2​<0) Xˉ2\bar{X}_{2}Xˉ2​ will produce an increase in an independent-samples t-test , how will the null hypothesis be stated?

If a researcher predicts the experimental treatment (Xˉ1−Xˉ2>0)\left(\bar{X}_{1}-\bar{X}_{2}>0\right)(Xˉ1​−Xˉ2​>0) Xˉ2\bar{X}_{2}Xˉ2​ will produce an decrease in an independent-samples t-test , how will the alternative hypothesis be stated?

What are the degrees of freedom for an independent-samples t-test using two samples with n = 20 in each sample?

What can we conclude if we reject the null hypothesis in an independent-samples t-test?

The freshmen competed with the sophomores to see who could raise the most money by recycling.The appropriate design for testing the significance of the difference between the means is

What is the standard error of the difference?

If a researcher predicts the experimental treatment (Xˉ1−Xˉ2>0)\left(\bar{X}_{1}-\bar{X}_{2}>0\right)(Xˉ1​−Xˉ2​>0) Xˉ2\bar{X}_{2}Xˉ2​ will produce a decrease in an independent-samples t-test , how will the null hypothesis be stated?

If the variance for Sample 1 is 5 and the variance for Sample 2 is 3, where n1n_{1}n1​ = 10 and n2n_{2}n2​ = 12, what is SXˉ1−Xˉ2S \bar{X}_{1}-\bar{X}_{2}SXˉ1​−Xˉ2​ ?

Suppose you want to do an independent-samples t-test where you have 60 subjects in one group and 53 in the other group.Are the unequal ns problematic?

Suppose a researcher assessed attitudes towards a certain brand of soda before and after conducting a taste test and noted the following results: Pre Post 5 7 4 9 3 4 5 10 4 4 5 4 What is the mean difference?

In an experiment, the "proportion of variance accounted for" is also called the

A Cohen's d value of .5 would be viewed as indicative of a effect.

The sampling distribution of differences between means is the distribution of all possible

Suppose you measure the IQ of 14 subjects with short index fingers and the IQ of 14 subjects with long index fingers.You compute an independent-samples t-test, and the tobtt_{o b t}tobt​ is 0.29, which is not statistically significant.What is the most appropriate conclusion?

In order to find the t-obtained for an independent t-test, which step is not required?

How many subjects participated in an independent-samples t-test if a researcher reports t20) = 3.68?

An appropriate example of a repeated measures design would be

In a study involving stress among college students, a group of seniors are asked to complete a stress survey.After a two-hour seminar on relaxation methods, they are asked to complete the stress survey again.The appropriate design for testing the significance of the difference between the means is

Introduction to Statistics and Research

Creating and Using Frequency Distributions

Summarizing Scores With Measures of Central Tendency

Summarizing Scores With Measures of Variability

Describing Data With Z-Scores and the Normal Curve

Using Probability to Make Decisions About Data

Overview of Statistical Hypothesis Testing: the Z-Test

Hypothesis Testing Using the One-Sample T-Test

Describing Relationships Using Correlation and Regression

Hypothesis Testing Using the One-Way Analysis of Variance

Understanding the Two-Way Analysis of Variance

Chi Square and Nonparametric Procedures

Filters

If a researcher predicts the experimental treatment $\left(\bar{X}_{1}-\bar{X}_{2}<0\right)$ $\bar{X}_{2}$ will produce an increase in an independent-samples t-test , how will the null hypothesis be stated?

If a researcher predicts the experimental treatment $\left(\bar{X}_{1}-\bar{X}_{2}>0\right)$ $\bar{X}_{2}$ will produce an decrease in an independent-samples t-test , how will the alternative hypothesis be stated?

If a researcher predicts the experimental treatment $\left(\bar{X}_{1}-\bar{X}_{2}>0\right)$ $\bar{X}_{2}$ will produce a decrease in an independent-samples t-test , how will the null hypothesis be stated?

If the variance for Sample 1 is 5 and the variance for Sample 2 is 3, where $n_{1}$ = 10 and $n_{2}$ = 12, what is $S \bar{X}_{1}-\bar{X}_{2}$ ?

Suppose you measure the IQ of 14 subjects with short index fingers and the IQ of 14 subjects with long index fingers.You compute an independent-samples t-test, and the $t_{o b t}$ is 0.29, which is not statistically significant.What is the most appropriate conclusion?