Question 1

The value of the alpha level has no effect on the power of a statistical test.

Accepted Answer

A) True 
 B)False  False

Question 2

If a researcher rejects a null hypothesis that is true,then a _____ has been made.

Accepted Answer

A) Type II error 
B) sampling error 
C) Type I error 
D) correct decision 
A) Type II error 
B) sampling error 
C) Type I error 
D) correct decision C

Question 3

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 investigator will correctly reject the null hypothesis when it is false,and this probability is called the power of the statistical test.The power of the statistical test is influenced by three factors.The alpha level directly affects the power of the statistical test,with more conservative alpha levels yielding less powerful tests,everything else being equal.The power of the statistical test is also influenced by the sample size:The larger the sample size,the more powerful the statistical test will be,everything else being equal.Finally,power is influenced by how discrepant the population mean is from the value of the population mean specified in the null hypothesis.The larger the discrepancy,the more powerful the statistical test will be,everything else being equal.

Question 4

Which of the following describes a typical null hypothesis?

Accepted Answer

A) µ=150 
B) µ   
150 
C) µ150 
A) µ=150 
B) µ   
150 
C) µ150

Question 5

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 6

Which characteristics of the t distribution influences its shape?

Accepted Answer

A) population mean 
B) sample size 
C) sample mean 
D) size of confidence interval 
A) population mean 
B) sample size 
C) sample mean 
D) size of confidence interval

Question 7

Which of the following symbols represents the power of a statistical test?

Accepted Answer

A) a 
B) b 
C) 1 - a 
D) 1 - b 
A) a 
B) b 
C) 1 - a 
D) 1 - b

Question 8

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 9

The alpha level reflects the probability of making a Type II error.

Accepted Answer

A) True 
 B)False

Question 10

As with the normal distribution,there is a single t distribution for every sample size.

Accepted Answer

A) True 
 B)False

Question 11

What does it mean to say that a test is robust to violations of a distributional assumption?

Accepted Answer

When we say that a test is robust to vio

Question 12

When _____,and the raw scores in the population are normally distributed,then the normal and t distributions are quite _____ one another.

Accepted Answer

A) N  40;similar to 
C) N = 40;different from 
D) none of these 
A) N  40;similar to 
C) N = 40;different from 
D) none of these

Question 13

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 14

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 15

Distinguish between a Type I error and a Type II error.

Accepted Answer

Once an investigator has drawn a conclus

Question 16

When the observed value of z falls within the range defined by the critical values,we _____ the null hypothesis.

Accepted Answer

A) fail to reject 
B) fail to accept 
C) reject 
D) accept 
A) fail to reject 
B) fail to accept 
C) reject 
D) accept

Question 17

When the observed value of z falls within the range defined by the critical values,we reject the null hypothesis.

Accepted Answer

A) True 
 B)False

Question 18

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 19

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 null hypothesis?

Accepted Answer

A) H0: ì   
500 
B) H0: ì 0: ì > 500 
D) H0: ì = 500 
A) H0: ì   
500 
B) H0: ì 0: ì > 500 
D) H0: ì = 500

Question 20

Traditionally,_____ is the probability associated with alpha.

Accepted Answer

A) .05 
B) .025 
C) .50 
D) 1-.05 
A) .05 
B) .025 
C) .50 
D) 1-.05

The value of the alpha level has no effect on the power of a statistical test.

If a researcher rejects a null hypothesis that is true,then a _____ has been made.

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

Which of the following describes a typical null hypothesis?

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

Which characteristics of the t distribution influences its shape?

Which of the following symbols represents the power of a statistical test?

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

The alpha level reflects the probability of making a Type II error.

As with the normal distribution,there is a single t distribution for every sample size.

What does it mean to say that a test is robust to violations of a distributional assumption?

When _,and the raw scores in the population are normally distributed,then the normal and t distributions are quite _ one another.

A 95% confidence interval for the mean:

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.

Distinguish between a Type I error and a Type II error.

When the observed value of z falls within the range defined by the critical values,we _____ the null hypothesis.

When the observed value of z falls within the range defined by the critical values,we reject the null hypothesis.

Which of the following accurately defines a Type I error?

Traditionally,_____ is the probability associated with alpha.

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

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

The value of the alpha level has no effect on the power of a statistical test.

If a researcher rejects a null hypothesis that is true,then a _____ has been made.

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

Which of the following describes a typical null hypothesis?

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

Which characteristics of the t distribution influences its shape?

Which of the following symbols represents the power of a statistical test?

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

The alpha level reflects the probability of making a Type II error.

As with the normal distribution,there is a single t distribution for every sample size.

What does it mean to say that a test is robust to violations of a distributional assumption?

When _____,and the raw scores in the population are normally distributed,then the normal and t distributions are quite _____ one another.

A 95% confidence interval for the mean:

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.

Distinguish between a Type I error and a Type II error.

When the observed value of z falls within the range defined by the critical values,we _____ the null hypothesis.

When the observed value of z falls within the range defined by the critical values,we reject the null hypothesis.

Which of the following accurately defines a Type I error?

Traditionally,_____ is the probability associated with alpha.

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

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

When _,and the raw scores in the population are normally distributed,then the normal and t distributions are quite _ one another.