Question 1

All other things being equal,with which of the following alpha levels would we be most likely to reject the null hypothesis?

Accepted Answer

A) .01 
B) .001 
C) .05 
D) .10 
A) .01 
B) .001 
C) .05 
D) .10

Question 2

Sixty percent of the respondents in a random sample drawn from a neighborhood are Democrats.The community as a whole is 75% Democrat.The difference between sample and population has been tested and the null hypothesis has been rejected.What may we conclude?

Accepted Answer

A) a Type I error has been committed 
B) a one-tailed test has been used 
C) the neighborhood is significantly less likely to be Democrat 
D) the difference is not significant 
A) a Type I error has been committed 
B) a one-tailed test has been used 
C) the neighborhood is significantly less likely to be Democrat 
D) the difference is not significant

Question 3

Under what conditions would you use the t distribution to test the significance of a single sample proportion?

Accepted Answer

A) none,use the Z distribution as long as sample size is large 
B) only when the population standard deviation is known 
C) only when sample size is less than or equal to 120 
D) only when the population is normally distributed 
A) none,use the Z distribution as long as sample size is large 
B) only when the population standard deviation is known 
C) only when sample size is less than or equal to 120 
D) only when the population is normally distributed

Question 4

When testing a single sample mean for significance when the population standard deviation is unknown and sample size is 75,the correct sampling distribution is

Accepted Answer

A) the t distribution. 
B) the Z distribution. 
C) it makes no difference. 
D) t for a one-tailed test,Z for a two-tailed test. 
A) the t distribution. 
B) the Z distribution. 
C) it makes no difference. 
D) t for a one-tailed test,Z for a two-tailed test.

Question 5

The critical region is

Accepted Answer

A) the area under the curve that contains "non-rare" events. 
B) the area under the curve that includes those values of a sample statistic that will lead to rejection of the null. 
C) a confidence interval. 
D) a law that states that the shape of the sampling distribution is normal. 
A) the area under the curve that contains "non-rare" events. 
B) the area under the curve that includes those values of a sample statistic that will lead to rejection of the null. 
C) a confidence interval. 
D) a law that states that the shape of the sampling distribution is normal.

Question 6

A researcher is investigating an outreach program that is intended to reduce the number of homeless children in the state.In this situation,it would be appropriate to use a ____ test of significance

Accepted Answer

A) random. 
B) non-probability. 
C) one-tailed. 
D) zero alpha. 
A) random. 
B) non-probability. 
C) one-tailed. 
D) zero alpha.

Question 7

As the Critical Region decreases in size,

Accepted Answer

A) the probability of Type I error increases. 
B) the probability of rejecting the null hypothesis increases. 
C) alpha increase. 
D) the probability of Type II error increases. 
A) the probability of Type I error increases. 
B) the probability of rejecting the null hypothesis increases. 
C) alpha increase. 
D) the probability of Type II error increases.

Question 8

Republicans average 1.4 children while the state as a whole averages 1.7 children.The Z scored computed in this test is 0.78 and the alpha level is 0.05.Therefore,the difference in size of family

Accepted Answer

A) is due to random chance. 
B) does not reflect the situation of all Republicans. 
C) is significant. 
D) all of the above 
A) is due to random chance. 
B) does not reflect the situation of all Republicans. 
C) is significant. 
D) all of the above

Question 9

If the critical region begins at Z (critical)=$\pm$2.56 and the test statistic is -2.50,we

Accepted Answer

A) fail to reject the null hypothesis. 
B) reject the null hypothesis. 
C) cannot make a decision because the test statistic is so close to the critical region. 
D) change the alpha level. 
A) fail to reject the null hypothesis. 
B) reject the null hypothesis. 
C) cannot make a decision because the test statistic is so close to the critical region. 
D) change the alpha level.

Question 10

A sample of people attending a professional football game averages 13.7 years of formal education while the surrounding community averages 12.1.The difference is significant at the .05 level.What could we conclude?

Accepted Answer

A) the null hypothesis should be accepted 
B) the research hypothesis should be rejected 
C) the sample is significantly more educated than the community as a whole 
D) the alpha level is too low 
A) the null hypothesis should be accepted 
B) the research hypothesis should be rejected 
C) the sample is significantly more educated than the community as a whole 
D) the alpha level is too low

Question 11

A researcher selected a sample of 56 former student leaders from a list of graduates of a large university.She discovered that it had taken an average of 4.97 years for these graduates to finish their degrees,with a standard deviation of 1.23.The average for the entire student body is 4.56 years.Is the difference statistically significant? Follow the five-step model and state all important decisions.Make sure that you interpret the results in terms of the original research question.

Accepted Answer

The answer of A researcher selected a sample of 56...

Question 12

In hypothesis testing,the ____ is the critical assumption,the assumption which is actually tested.

Accepted Answer

A) research hypothesis 
B) null hypothesis 
C) assumption of a normal sampling distribution 
D) assumption that the sample was randomly selected 
A) research hypothesis 
B) null hypothesis 
C) assumption of a normal sampling distribution 
D) assumption that the sample was randomly selected

Question 13

Do students who are members of fraternities or sororities have GPAs different from the student body as a whole? A random sample of 123 "Greeks" has been selected from the student body of a large university.The GPA for the student body as a whole is 2.59 and the mean for the sample is 2.47 with a standard deviation of 0.34.Is the difference statistically significant? Follow the five-step model and state all important decisions.Make sure that you interpret the results in terms of the original research question.

Accepted Answer

The answer of Do students who are members of fraternities...

Question 14

The null hypothesis in the one sample case is a statement of

Accepted Answer

A) agreement with the research hypothesis. 
B) rejection. 
C) acceptance. 
D) no difference. 
A) agreement with the research hypothesis. 
B) rejection. 
C) acceptance. 
D) no difference.

Question 15

The higher the alpha level,the more likely we will

Accepted Answer

A) commit a Type I error. 
B) commit a Type II error. 
C) conduct a two-tailed test. 
D) be unable to decide whether to reject or fail to reject the null hypothesis. 
A) commit a Type I error. 
B) commit a Type II error. 
C) conduct a two-tailed test. 
D) be unable to decide whether to reject or fail to reject the null hypothesis.

Question 16

Do sex education classes and free clinics that offer counseling for teenagers reduce the number of pregnancies among teenagers? The appropriate test of hypothesis would be

Accepted Answer

A) a one-tailed test. 
B) a two-tailed test. 
C) cross-sectional. 
D) participant observation. 
A) a one-tailed test. 
B) a two-tailed test. 
C) cross-sectional. 
D) participant observation.

Question 17

Which of the following must be normally distributed in order to proceed with hypothesis testing of means and proportions?

Accepted Answer

A) the sample distribution 
B) the sampling distribution 
C) the population distribution 
D) both the sample distribution and the population distribution 
A) the sample distribution 
B) the sampling distribution 
C) the population distribution 
D) both the sample distribution and the population distribution

Question 18

The central problem in the case of one sample hypothesis test is to determine

Accepted Answer

A) if a sample is random. 
B) if sample statistics are the same as those of the sampling distribution. 
C) if parameters are representative of population. 
D) if a sample came from a population with a certain characteristic. 
A) if a sample is random. 
B) if sample statistics are the same as those of the sampling distribution. 
C) if parameters are representative of population. 
D) if a sample came from a population with a certain characteristic.

Question 19

Cite an example of a research situation in which a one-tailed test of significance would be appropriate.

Accepted Answer

A one-tailed test of significance is app

Question 20

In a one-tailed test of hypothesis,the entire ____ should be placed in either the upper or lower tail of the ____.

Accepted Answer

A) critical area,sampling distribution 
B) sample mean,population distribution 
C) Z score,critical area 
D) sampling distribution,sample distribution 
A) critical area,sampling distribution 
B) sample mean,population distribution 
C) Z score,critical area 
D) sampling distribution,sample distribution

All other things being equal,with which of the following alpha levels would we be most likely to reject the null hypothesis?

Sixty percent of the respondents in a random sample drawn from a neighborhood are Democrats.The community as a whole is 75% Democrat.The difference between sample and population has been tested and the null hypothesis has been rejected.What may we conclude?

Under what conditions would you use the t distribution to test the significance of a single sample proportion?

When testing a single sample mean for significance when the population standard deviation is unknown and sample size is 75,the correct sampling distribution is

The critical region is

A researcher is investigating an outreach program that is intended to reduce the number of homeless children in the state.In this situation,it would be appropriate to use a ____ test of significance

As the Critical Region decreases in size,

Republicans average 1.4 children while the state as a whole averages 1.7 children.The Z scored computed in this test is 0.78 and the alpha level is 0.05.Therefore,the difference in size of family

If the critical region begins at Z (critical)= $\pm$ 2.56 and the test statistic is -2.50,we

A sample of people attending a professional football game averages 13.7 years of formal education while the surrounding community averages 12.1.The difference is significant at the .05 level.What could we conclude?

In hypothesis testing,the ____ is the critical assumption,the assumption which is actually tested.

The null hypothesis in the one sample case is a statement of

The higher the alpha level,the more likely we will

Do sex education classes and free clinics that offer counseling for teenagers reduce the number of pregnancies among teenagers? The appropriate test of hypothesis would be

Which of the following must be normally distributed in order to proceed with hypothesis testing of means and proportions?

The central problem in the case of one sample hypothesis test is to determine

Cite an example of a research situation in which a one-tailed test of significance would be appropriate.

In a one-tailed test of hypothesis,the entire should be placed in either the upper or lower tail of the .

Introduction

Basic Descriptive Statistics: Percentages, Ratios and Rates, Tables, Charts and Graphs

Measures of Central Tendency

Measures of Dispersion

The Normal Curve

Introduction to Inferential Statistics: Sampling and the Sampling Distribution

Estimation Procedures

Hypothesis Testing II: the Two-Sample Case

Hypothesis Testing III: the Analysis of Variance

Hypothesis Testing Iv: Chi Square

Bivariate Association: Introduction and Basic Concepts

Association Between Variables Measured at the Nominal Level

Association Between Variables Measured at the Ordinal Level

Association Between Variables Measured at the Interval-Ratio Level

Elaborating Bivariate Tables

Partial Correlation and Multiple Regression and Correlation

Filters

Exam 8: Hypothesis Testing I: the One-Sample Case

All other things being equal,with which of the following alpha levels would we be most likely to reject the null hypothesis?

Sixty percent of the respondents in a random sample drawn from a neighborhood are Democrats.The community as a whole is 75% Democrat.The difference between sample and population has been tested and the null hypothesis has been rejected.What may we conclude?

Under what conditions would you use the t distribution to test the significance of a single sample proportion?

When testing a single sample mean for significance when the population standard deviation is unknown and sample size is 75,the correct sampling distribution is

The critical region is

A researcher is investigating an outreach program that is intended to reduce the number of homeless children in the state.In this situation,it would be appropriate to use a ____ test of significance

As the Critical Region decreases in size,

Republicans average 1.4 children while the state as a whole averages 1.7 children.The Z scored computed in this test is 0.78 and the alpha level is 0.05.Therefore,the difference in size of family

If the critical region begins at Z (critical)= ±\pm± 2.56 and the test statistic is -2.50,we

A sample of people attending a professional football game averages 13.7 years of formal education while the surrounding community averages 12.1.The difference is significant at the .05 level.What could we conclude?

In hypothesis testing,the ____ is the critical assumption,the assumption which is actually tested.

The null hypothesis in the one sample case is a statement of

The higher the alpha level,the more likely we will

Do sex education classes and free clinics that offer counseling for teenagers reduce the number of pregnancies among teenagers? The appropriate test of hypothesis would be

Which of the following must be normally distributed in order to proceed with hypothesis testing of means and proportions?

The central problem in the case of one sample hypothesis test is to determine

Cite an example of a research situation in which a one-tailed test of significance would be appropriate.

In a one-tailed test of hypothesis,the entire ____ should be placed in either the upper or lower tail of the ____.

Introduction

Basic Descriptive Statistics: Percentages, Ratios and Rates, Tables, Charts and Graphs

Measures of Central Tendency

Measures of Dispersion

The Normal Curve

Introduction to Inferential Statistics: Sampling and the Sampling Distribution

Estimation Procedures

Hypothesis Testing II: the Two-Sample Case

Hypothesis Testing III: the Analysis of Variance

Hypothesis Testing Iv: Chi Square

Bivariate Association: Introduction and Basic Concepts

Association Between Variables Measured at the Nominal Level

Association Between Variables Measured at the Ordinal Level

Association Between Variables Measured at the Interval-Ratio Level

Elaborating Bivariate Tables

Partial Correlation and Multiple Regression and Correlation

Filters

If the critical region begins at Z (critical)= $\pm$ 2.56 and the test statistic is -2.50,we

In a one-tailed test of hypothesis,the entire should be placed in either the upper or lower tail of the .