Question 1

To estimate the standard deviation of the sampling distribution when using a single-sample t test,we use the

Accepted Answer

A) estimated standard deviation. 
B) estimated population standard deviation. 
C) estimated standard error of the mean. 
D) true standard error of the mean. 
A) estimated standard deviation. 
B) estimated population standard deviation. 
C) estimated standard error of the mean. 
D) true standard error of the mean.

Question 2

Rich performed a two-tailed test for an experiment in which n=20.He could not find his t critical values table but he remembered the tcv at df = 15.He decided to compare his tobt to this tcv.Is he more likely to make a Type I or a Type II error in this situation?

Accepted Answer

Rich is more likely to make a

Question 3

A researcher in interested in whether students who are musicians have higher intelligence test scores than students in the general population.The researcher predicts that playing a musical instrument is associated with higher intelligence test scores.The researcher selects a sample of 75 musicians from local high schools and gives them an intelligence test.She compares their average intelligence to that of students in the general population and finds that zobt = +1.92.This is a _____ test and the researcher should conclude _____.

Accepted Answer

A) one-tailed; that students who are musicians score significantly higher on intelligence tests 
B) two-tailed; that students who are musicians score significantly higher on intelligence tests 
C) one-tailed; that students who are musicians do not score significantly higher on intelligence tests 
D) two-tailed; that students who are musicians do not score significantly higher on intelligence tests 
A) one-tailed; that students who are musicians score significantly higher on intelligence tests 
B) two-tailed; that students who are musicians score significantly higher on intelligence tests 
C) one-tailed; that students who are musicians do not score significantly higher on intelligence tests 
D) two-tailed; that students who are musicians do not score significantly higher on intelligence tests

Question 4

Sometimes researchers use estimation of population means,rather than hypothesis tests.These estimations are based on

Accepted Answer

A) the standard error of the mean. 
B) the standard deviation. 
C) the z test. 
D) confidence intervals. 
A) the standard error of the mean. 
B) the standard deviation. 
C) the z test. 
D) confidence intervals.

Question 5

The standard error of the mean will always be ____ the standard deviation for a distribution of individual scores.

Accepted Answer

A) smaller than 
B) larger than 
C) the same as 
D) the same as or larger than 
A) smaller than 
B) larger than 
C) the same as 
D) the same as or larger than

Question 6

Explain why   decreases as the size of the samples in the sampling distribution increase.Your answer should include an explanation based on the formula for   and an explanation of why this formula makes sense (in other words,why would increasing the size of each sample in the sampling distribution cause   to decrease?

Accepted Answer

@#IMG-DLM& decreases when the sample size increase

Question 7

What are the assumptions of the t test?

Accepted Answer

The t test is based on a bell-

Question 8

What is the standard error of the mean for a distribution of scores where $\sigma$= 15 and n = 100?

Accepted Answer

A) .15 
B) 1.5 
C) 15 
D) unable to determine 
A) .15 
B) 1.5 
C) 15 
D) unable to determine

Question 9

A _____-tailed test and a _____ sample size will both increase the power of the test.

Accepted Answer

A) two; larger 
B) one; larger 
C) two; smaller 
D) one; smaller 
A) two; larger 
B) one; larger 
C) two; smaller 
D) one; smaller

Question 10

The number of scores in a sample that are free to vary represents the

Accepted Answer

A) sample size. 
B) N. 
C)  the degrees of freedom. 
D) none of the other options is correct 
A) sample size. 
B) N. 
C)  the degrees of freedom. 
D) none of the other options is correct

Question 11

What is the standard error of the mean for a distribution of scores where $\sigma$= 24 and n = 144?

Accepted Answer

A) 20 
B) .167 
C) 2.0 
D) unable to determine 
A) 20 
B) .167 
C) 2.0 
D) unable to determine

Question 12

A researcher in interested in whether students who are musicians have higher intelligence test scores than students in the general population.The researcher predicts that playing a musical instrument is associated with higher intelligence test scores.The researcher selects a sample of 75 musicians from local high schools and gives them an intelligence test.The mean for the sample is 105.The mean for the general population (µ)is 100 with a standard deviation ($\sigma$)of 15.What is zobt for this sample?

Accepted Answer

A) .33 
B) 1.89 
C) 2.89 
D) 3.25 
A) .33 
B) 1.89 
C) 2.89 
D) 3.25

Question 13

Zcv for a one-tailed test is _____ whereas Zcv for a two-tailed test is _____.

Accepted Answer

A) $\pm$ 1.645; $\pm$1.96 
B) $\pm$1.96; $\pm$1.645 
C) .01; .05 
D) .05; .01 
A) $\pm$ 1.645; $\pm$1.96 
B) $\pm$1.96; $\pm$1.645 
C) .01; .05 
D) .05; .01

Question 14

When comparing a sample to a population,if you know $\mu$ and $\sigma$ and have a sample size larger than 30,you should conduct a _____ test.

Accepted Answer

A) t 
B) z 
C) $\chi$2 
D) phi 
A) t 
B) z 
C) $\chi$2 
D) phi

Question 15

A researcher in interested in whether students who play sports have a higher or lower body mass index (BMI)than students in the general population.The researcher is unsure whether playing sports will decrease body mass (due to more calories burned)or increase body mass (due to more muscle mass).This is a _____ tailed test and the zcv is _____.

Accepted Answer

A) two; ±1.96 
B) one; ±1.65 
C) two; ±1.65 
D) one; ±1.96 
A) two; ±1.96 
B) one; ±1.65 
C) two; ±1.65 
D) one; ±1.96

Question 16

For a single-sample t test with 10 participants,the degrees of freedom are

Accepted Answer

A) 10. 
B) 9. 
C) 8. 
D) unable to be determined. 
A) 10. 
B) 9. 
C) 8. 
D) unable to be determined.

Question 17

What are the assumptions of the $\chi$2-test?

Accepted Answer

The assumptions of the @#LAT-DLM&<sup>2<

Question 18

How does sample size affect the tcv?

Accepted Answer

As sample size increases,the d

Question 19

If a researcher reported for a two-tailed single-sample t-test that t(13)= 1.46,then

Accepted Answer

A) p < .02. 
B) p < .05. 
C) p < .01. 
D) the results is not significant. 
A) p < .02. 
B) p < .05. 
C) p < .01. 
D) the results is not significant.

Question 20

_____ statistics are used in the process of hypothesis testing.

Accepted Answer

A) Descriptive 
B) Null 
C) Alternative 
D) Inferential 
A) Descriptive 
B) Null 
C) Alternative 
D) Inferential

To estimate the standard deviation of the sampling distribution when using a single-sample t test,we use the

Rich performed a two-tailed test for an experiment in which n=20.He could not find his t critical values table but he remembered the t_cv at df = 15.He decided to compare his t_obt to this t_cv.Is he more likely to make a Type I or a Type II error in this situation?

Sometimes researchers use estimation of population means,rather than hypothesis tests.These estimations are based on

The standard error of the mean will always be ____ the standard deviation for a distribution of individual scores.

What are the assumptions of the t test?

What is the standard error of the mean for a distribution of scores where $\sigma$ = 15 and n = 100?

A _-tailed test and a _ sample size will both increase the power of the test.

The number of scores in a sample that are free to vary represents the

What is the standard error of the mean for a distribution of scores where $\sigma$ = 24 and n = 144?

Z_cv for a one-tailed test is _____ whereas Z_cv for a two-tailed test is _____.

When comparing a sample to a population,if you know $\mu$ and $\sigma$ and have a sample size larger than 30,you should conduct a _____ test.

For a single-sample t test with 10 participants,the degrees of freedom are

What are the assumptions of the $\chi$ ²-test?

How does sample size affect the t_cv?

If a researcher reported for a two-tailed single-sample t-test that t(13)= 1.46,then

_____ statistics are used in the process of hypothesis testing.

Thinking Like a Scientist

Getting Started: Ideas, resources, and Ethics

Defining, measuring, and Manipulating Variables

Descriptive Methods

Data Organization and Descriptive Statistics

Correlational Methods and Statistics

Probability and Hypothesis Testing

The Logic of Experimental Design

Inferential Statistics: Two-Group Designs

Experimental Designs With More Than Two Levels of an Independent Variable

Complex Experimental Design

Quasi-Experimental and Single-Case Designs

Apa Communication Guidelines

Filters

Exam 8: Introduction to Inferential Statistics

To estimate the standard deviation of the sampling distribution when using a single-sample t test,we use the

Rich performed a two-tailed test for an experiment in which n=20.He could not find his t critical values table but he remembered the tcv at df = 15.He decided to compare his tobt to this tcv.Is he more likely to make a Type I or a Type II error in this situation?

Sometimes researchers use estimation of population means,rather than hypothesis tests.These estimations are based on

The standard error of the mean will always be ____ the standard deviation for a distribution of individual scores.

What are the assumptions of the t test?

What is the standard error of the mean for a distribution of scores where σ\sigmaσ = 15 and n = 100?

A _____-tailed test and a _____ sample size will both increase the power of the test.

The number of scores in a sample that are free to vary represents the

What is the standard error of the mean for a distribution of scores where σ\sigmaσ = 24 and n = 144?

Zcv for a one-tailed test is _____ whereas Zcv for a two-tailed test is _____.

When comparing a sample to a population,if you know μ\muμ and σ\sigmaσ and have a sample size larger than 30,you should conduct a _____ test.

For a single-sample t test with 10 participants,the degrees of freedom are

What are the assumptions of the χ\chiχ 2-test?

How does sample size affect the tcv?

If a researcher reported for a two-tailed single-sample t-test that t(13)= 1.46,then

_____ statistics are used in the process of hypothesis testing.

Thinking Like a Scientist

Getting Started: Ideas, resources, and Ethics

Defining, measuring, and Manipulating Variables

Descriptive Methods

Data Organization and Descriptive Statistics

Correlational Methods and Statistics

Probability and Hypothesis Testing

The Logic of Experimental Design

Inferential Statistics: Two-Group Designs

Experimental Designs With More Than Two Levels of an Independent Variable

Complex Experimental Design

Quasi-Experimental and Single-Case Designs

Apa Communication Guidelines

Filters

Rich performed a two-tailed test for an experiment in which n=20.He could not find his t critical values table but he remembered the t_cv at df = 15.He decided to compare his t_obt to this t_cv.Is he more likely to make a Type I or a Type II error in this situation?

What is the standard error of the mean for a distribution of scores where $\sigma$ = 15 and n = 100?

A _-tailed test and a _ sample size will both increase the power of the test.

What is the standard error of the mean for a distribution of scores where $\sigma$ = 24 and n = 144?

Z_cv for a one-tailed test is _____ whereas Z_cv for a two-tailed test is _____.

When comparing a sample to a population,if you know $\mu$ and $\sigma$ and have a sample size larger than 30,you should conduct a _____ test.

What are the assumptions of the $\chi$ ²-test?

How does sample size affect the t_cv?