Question 1

Which of the following "t statements" is the proper way to present data in an manuscript using APA format?

Accepted Answer

A) t = 3.93,df = 29,p<.05 
B) t(29)= 3.93,p<.05. 
C) t(df=29)= 3.93,p<.05,SD = 5.71 
D) t = 3.93,df = 29,p<.05,SD = 5.71 
A) t = 3.93,df = 29,p<.05 
B) t(29)= 3.93,p<.05. 
C) t(df=29)= 3.93,p<.05,SD = 5.71 
D) t = 3.93,df = 29,p<.05,SD = 5.71

Question 2

A directional alternative hypothesis is one that specifies that a population mean is different from a given value and also indicates the direction of that difference.

Accepted Answer

A) True 
 B)False

Question 3

When we use inferential statistics to address a research question,we _____.

Accepted Answer

A) have collected information from the entire population 
B) perform all calculations in the same way as with descriptive statistics 
C) make generalizations from a sample to the population it was sampled from 
D) all of these 
A) have collected information from the entire population 
B) perform all calculations in the same way as with descriptive statistics 
C) make generalizations from a sample to the population it was sampled from 
D) all of these

Question 4

Type II errors have a probability of occurring equal to _____.

Accepted Answer

A) â 
B) 1-â 
C) 1-á 
D) á 
A) â 
B) 1-â 
C) 1-á 
D) á

Question 5

The larger the sample size,the more powerful the statistical test will be,everything else being equal.

Accepted Answer

A) True 
 B)False

Question 6

For an alpha level of .05,an unexpected result in a one sample z test includes any sample mean occurring more than 1.96 standard errors below or 1.96 standard errors above the value of ì represented in the null hypothesis.

Accepted Answer

A) True 
 B)False

Question 7

The probability that an investigator will correctly reject the null hypothesis when it is false is called the power of the statistical test.

Accepted Answer

A) True 
 B)False

Question 8

Which is more powerful--a directional or a nondirectional test?

Accepted Answer

In general,a directional test will be mo

Question 9

As a rough guide,investigators generally attempt to achieve statistical power in the range of .05 to .95,depending on the nature of the proposition being investigated.

Accepted Answer

A) True 
 B)False

Question 10

A 95% confidence interval for the mean:

Accepted Answer

A) defines the range of scores in which there is a .95 probability the population mean will fall 
B) is computed using the standard error of the mean 
C) is unaffected by the "confidence level" you choose 
D) both a and b 
A) defines the range of scores in which there is a .95 probability the population mean will fall 
B) is computed using the standard error of the mean 
C) is unaffected by the "confidence level" you choose 
D) both a and b

Question 11

The formula for determining the standard error of the population mean is _____.

Accepted Answer

A) ó/   
B) ó/N 
C) ó/N-1 
D) s/N-1 
A) ó/   
B) ó/N 
C) ó/N-1 
D) s/N-1

Question 12

Which of the following accurately defines a Type I error?

Accepted Answer

A) rejecting a H0 when it is true 
B) rejecting a H0 when it is false 
C) failing to reject a H0 when it is true 
D) failing to reject a H0 when it is false 
A) rejecting a H0 when it is true 
B) rejecting a H0 when it is false 
C) failing to reject a H0 when it is true 
D) failing to reject a H0 when it is false

Question 13

The critical t value needed to reject the null will always be _____ than a Z value for the same set of scores.

Accepted Answer

A) less 
B) larger 
C) equal 
D) different 
A) less 
B) larger 
C) equal 
D) different

Question 14

Suppose you know that the mean score (m)on a measure of the personality trait "Openness to Experience" is 35.66 in a population of artists,with a standard deviation (s)of 13.32.Next,assume you went to Greenwich Village and gave this personality measure to a group of 10 artists.The mean in this sample was 40.33.You are interested in testing whether the 10 Greenwich Village artists were sampled from the same population described above.How would you state the null hypothesis for this test?

Accepted Answer

The answer of Suppose you know that the mean score...

Question 15

The t-distribution should be used when _____,while the z-distribution should be used when _____.

Accepted Answer

A) sample sizes are large;sample sizes are small 
B) sample sizes are small;m and s are known 
C) sample sizes are small;sample sizes are large 
D) both b and c 
A) sample sizes are large;sample sizes are small 
B) sample sizes are small;m and s are known 
C) sample sizes are small;sample sizes are large 
D) both b and c

Question 16

Based on the Method of Presentation section of Chapter 8,the null and alternative hypotheses should be formally written out when reporting the results of a statistical test in a psychological journal.

Accepted Answer

A) True 
 B)False

Question 17

A group of 200 students takes the Kaplan course in hopes that it will improve their SAT scores above the national mean of 500 on the math section.The population standard deviation of the SAT is known to be 100.Use an alpha level of .05 when answering the following questions.What is the alternative hypothesis?

Accepted Answer

A) H1: ì  
500 
B) H1: ì 1: ì > 500 
D) H1: ì = 500 
A) H1: ì  
500 
B) H1: ì 1: ì > 500 
D) H1: ì = 500

Question 18

The more conservative the alpha level,the less powerful the statistical test will be,everything else being equal.

Accepted Answer

A) True 
 B)False

Question 19

What is the power of a statistical test? What factors influence the power of a statistical test?

Accepted Answer

1- â defines the probability that an inv

Question 20

Failure to reject the null hypothesis when it is false is called a Type I error.

Accepted Answer

A) True 
 B)False

Which of the following "t statements" is the proper way to present data in an manuscript using APA format?

A directional alternative hypothesis is one that specifies that a population mean is different from a given value and also indicates the direction of that difference.

When we use inferential statistics to address a research question,we _____.

Type II errors have a probability of occurring equal to _____.

The larger the sample size,the more powerful the statistical test will be,everything else being equal.

For an alpha level of .05,an unexpected result in a one sample z test includes any sample mean occurring more than 1.96 standard errors below or 1.96 standard errors above the value of ì represented in the null hypothesis.

The probability that an investigator will correctly reject the null hypothesis when it is false is called the power of the statistical test.

Which is more powerful--a directional or a nondirectional test?

As a rough guide,investigators generally attempt to achieve statistical power in the range of .05 to .95,depending on the nature of the proposition being investigated.

A 95% confidence interval for the mean:

The formula for determining the standard error of the population mean is _____.

Which of the following accurately defines a Type I error?

The critical t value needed to reject the null will always be _____ than a Z value for the same set of scores.

The t-distribution should be used when _,while the z-distribution should be used when _.

Based on the Method of Presentation section of Chapter 8,the null and alternative hypotheses should be formally written out when reporting the results of a statistical test in a psychological journal.

The more conservative the alpha level,the less powerful the statistical test will be,everything else being equal.

What is the power of a statistical test? What factors influence the power of a statistical test?

Failure to reject the null hypothesis when it is false is called a Type I 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

Probability

Principles of Research Design and Statistical Preliminaries for Analyzing Bivariate Relationships

Independent Groups T -Test

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 8: Hypothesis Testing: Inferences About a Single Mean

Which of the following "t statements" is the proper way to present data in an manuscript using APA format?

A directional alternative hypothesis is one that specifies that a population mean is different from a given value and also indicates the direction of that difference.

When we use inferential statistics to address a research question,we _____.

Type II errors have a probability of occurring equal to _____.

The larger the sample size,the more powerful the statistical test will be,everything else being equal.

For an alpha level of .05,an unexpected result in a one sample z test includes any sample mean occurring more than 1.96 standard errors below or 1.96 standard errors above the value of ì represented in the null hypothesis.

The probability that an investigator will correctly reject the null hypothesis when it is false is called the power of the statistical test.

Which is more powerful--a directional or a nondirectional test?

As a rough guide,investigators generally attempt to achieve statistical power in the range of .05 to .95,depending on the nature of the proposition being investigated.

A 95% confidence interval for the mean:

The formula for determining the standard error of the population mean is _____.

Which of the following accurately defines a Type I error?

The critical t value needed to reject the null will always be _____ than a Z value for the same set of scores.

The t-distribution should be used when _____,while the z-distribution should be used when _____.

Based on the Method of Presentation section of Chapter 8,the null and alternative hypotheses should be formally written out when reporting the results of a statistical test in a psychological journal.

The more conservative the alpha level,the less powerful the statistical test will be,everything else being equal.

What is the power of a statistical test? What factors influence the power of a statistical test?

Failure to reject the null hypothesis when it is false is called a Type I 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

Probability

Principles of Research Design and Statistical Preliminaries for Analyzing Bivariate Relationships

Independent Groups T -Test

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 t-distribution should be used when _,while the z-distribution should be used when _.