Question 1

What is the largest risk of making a Type I error that social scientists will usually take?

Accepted Answer

A)  5% chance 
B)  68% chance 
C)  95% chance 
D)  99.7% chance 
A)  5% chance 
B)  68% chance 
C)  95% chance 
D)  99.7% chance

Question 2

Answer the questions that follow this SPSS output:

Your research hypothesis is "In the population, restaurants' average health inspection score in 2006 (HEALTHSCORE06) was higher than the average for those same restaurants in 2005 (HEALTHSCORE05)". (¯HEALTHSCORE06>¯HEALTHSCORE05) 
A) State the null hypothesis being tested.
B) Is this a one-tailed or two-tailed hypothesis?
C) Are your sample results consistent with the null hypothesis or the research hypothesis? (null / research)
D) What is the probability of getting the sample results you got if the null hypothesis is true? (If this step in hypothesis testing can be skipped, write the word "SKIP".)
E) What is your conclusion? (In other words, do you "reject" or "not reject" the null hypothesis based on these results?)
F) Are your results statistically significant? (yes / no)

Accepted Answer

a. In the population, restaurants' avera

Question 3

You are doing a two-tailed paired-samples t test and your results are statistically significant. The phrase "statistical significance" means the same as which of the following?

Accepted Answer

A)  There is a large difference between the means in the population. 
B)  There is an important difference between the means in the population. 
C)  You are willing to reject the claim that there is no difference between the means in the population. 
D)  You are NOT willing to reject the claim that there is no difference between the means in the population. 
A)  There is a large difference between the means in the population. 
B)  There is an important difference between the means in the population. 
C)  You are willing to reject the claim that there is no difference between the means in the population. 
D)  You are NOT willing to reject the claim that there is no difference between the means in the population.

Question 4

Answer the questions that follow this SPSS output: 
 
Your research hypothesis is "In the population, persons with 16 years of schooling average more children than persons with 20 years of schooling." ( ) 
A) State the null hypothesis being tested.
B) Is this a one-tailed or two-tailed hypothesis?
C) Are your sample results consistent with the null hypothesis or the research hypothesis? (null / research)
D) What is the significance level? (If this step in hypothesis testing can be skipped, write the word "SKIP".)
E) What is your conclusion? (In other words, do you "reject" or "not reject" the null hypothesis based on these results?)
F) Are your results statistically significant? (yes / no)

Accepted Answer

a. In the population, persons with 16 ye

Question 5

When does a researcher risk making a Type II error?

Accepted Answer

whenever he or she d

Question 6

Independent-samples t tests compare means for how many variables for how many groups of cases?

Accepted Answer

Independent-samples

Question 7

Write a research hypothesis and its companion null hypothesis that could be tested with an independent-samples t test.

Accepted Answer

Answers will vary: Research hypothesis-p

Question 8

You are testing a two-tailed hypothesis. Your SPSS output tells you that the two-tailed significance level of a particular t statistic is .01. What is the probability of making a Type I error if you reject the null hypothesis?

Accepted Answer

A)  .99 
B)  .05 
C)  .01 
D)  cannot be determined 
A)  .99 
B)  .05 
C)  .01 
D)  cannot be determined

Question 9

Answer the questions that follow this SPSS output: 
 
Your research hypothesis is "In the population, the average on the POSTTEST is higher than the average on the PRETEST." ( (POSTTEST) ̅>(PRETEST) ̅) 
A) State the null hypothesis being tested.
B) Is this a one-tailed or two-tailed hypothesis?
C) Are your sample results consistent with the null hypothesis or the research hypothesis? (null / research)
D) What is the probability of getting the sample results you got if the null hypothesis is true? (If this step in hypothesis testing can be skipped, write the word "SKIP".)
E) What is your conclusion? (In other words, do you "reject" or "not reject" the null hypothesis based on these results?)
F) Are your results statistically significant? (yes / no)

Accepted Answer

a. In the population, the average on the

Question 10

If the mean IQ of a sample of right-handed persons is significantly higher than the mean IQ of a sample of left-handed persons, then which of the following must be true?

Accepted Answer

A)  All right-handed persons must have higher IQs than all left-handed persons. 
B)  Most right-handed persons must have higher IQs than most left-handed persons. 
C)  The median IQ of right-handed persons must be higher than the median IQ of left-handed persons. 
D)  None of the above must be true. 
A)  All right-handed persons must have higher IQs than all left-handed persons. 
B)  Most right-handed persons must have higher IQs than most left-handed persons. 
C)  The median IQ of right-handed persons must be higher than the median IQ of left-handed persons. 
D)  None of the above must be true.

Question 11

Whenever you reject a null hypothesis, you may be making a correct decision or you may be making a Type ___ error; whenever you do not reject a null hypothesis, you may be making a correct decision or you may be making a Type _____ error.

Accepted Answer

The answer of Whenever you reject a null hypothesis, you...

Question 12

What kinds of questions can you answer using an independent-samples t test?

Accepted Answer

Do the means for these two gro

Question 13

Two researchers measure attitudes toward capital punishment in the year 2000 and again in the year 2005. One researcher uses a panel study design (the same persons are questioned in 2000 and in 2005); the other uses a trend study design (different samples from the population are questioned in 2000 and 2005). In analyzing the data that was collected,

Accepted Answer

A)  both researchers should use paired-sample t tests 
B)  both researchers should use independent-samples t tests 
C)  the panel study researcher should use paired-sample t tests but the trend study researcher should use independent-samples t tests 
D)  the panel study researcher should use independent-samples t tests but the trend study researcher should use paired-samples t tests 
A)  both researchers should use paired-sample t tests 
B)  both researchers should use independent-samples t tests 
C)  the panel study researcher should use paired-sample t tests but the trend study researcher should use independent-samples t tests 
D)  the panel study researcher should use independent-samples t tests but the trend study researcher should use paired-samples t tests

Question 14

For an independent-samples t test, the grouping variable (the variable whose attributes are used to identify the two groups to be compared) can be what level of measurement?

Accepted Answer

A)  only interval/ratio 
B)  either interval/ratio or ordinal 
C)  interval/ratio, ordinal, or nominal 
A)  only interval/ratio 
B)  either interval/ratio or ordinal 
C)  interval/ratio, ordinal, or nominal

Question 15

Without computing any new variables, which would be an appropriate statistical procedure to test the hypothesis that, on average, college students listen to less radio than they did when they were high school students?

Accepted Answer

A)  independent-samples t test 
B)  one-sample t test 
C)  paired-samples t test 
A)  independent-samples t test 
B)  one-sample t test 
C)  paired-samples t test

Question 16

Which would be an appropriate statistical procedure to test the hypothesis that Americans listen to radio an average of 200 minutes a day?

Accepted Answer

A)  independent-samples t test 
B)  one-sample t test 
C)  paired-samples t test 
A)  independent-samples t test 
B)  one-sample t test 
C)  paired-samples t test

Question 17

What kinds of questions can you answer using a paired-samples t test?

Accepted Answer

Are the means for these two variables si

Question 18

Which would be an appropriate statistical procedure to test the hypothesis that, on average, Democrats listen to more radio than Republicans?

Accepted Answer

A)  independent-samples t test 
B)  one-sample t test 
C)  paired-samples t test 
A)  independent-samples t test 
B)  one-sample t test 
C)  paired-samples t test

Question 19

Paired-samples t tests compare means for how many variables for how many groups of cases?

Accepted Answer

Paired-samples t tes

Question 20

Your independent-samples t test research hypothesis is that, when asked the ideal number of children to have, men report a higher average than women. The following results are consistent with the _____ and you proceed to _____.

Accepted Answer

A)  null hypothesis … Step 3 (check significance level) 
B)  null hypothesis … Step 4 (state conclusion) 
C)  research hypothesis … Step 3 (check significance level) 
D)  research hypothesis … Step 4 (state conclusion) 
A)  null hypothesis … Step 3 (check significance level) 
B)  null hypothesis … Step 4 (state conclusion) 
C)  research hypothesis … Step 3 (check significance level) 
D)  research hypothesis … Step 4 (state conclusion)

What is the largest risk of making a Type I error that social scientists will usually take?

You are doing a two-tailed paired-samples t test and your results are statistically significant. The phrase "statistical significance" means the same as which of the following?

When does a researcher risk making a Type II error?

Independent-samples t tests compare means for how many variables for how many groups of cases?

Write a research hypothesis and its companion null hypothesis that could be tested with an independent-samples t test.

You are testing a two-tailed hypothesis. Your SPSS output tells you that the two-tailed significance level of a particular t statistic is .01. What is the probability of making a Type I error if you reject the null hypothesis?

If the mean IQ of a sample of right-handed persons is significantly higher than the mean IQ of a sample of left-handed persons, then which of the following must be true?

Whenever you reject a null hypothesis, you may be making a correct decision or you may be making a Type _ error; whenever you do not reject a null hypothesis, you may be making a correct decision or you may be making a Type ___ error.

What kinds of questions can you answer using an independent-samples t test?

For an independent-samples t test, the grouping variable (the variable whose attributes are used to identify the two groups to be compared) can be what level of measurement?

Without computing any new variables, which would be an appropriate statistical procedure to test the hypothesis that, on average, college students listen to less radio than they did when they were high school students?

Which would be an appropriate statistical procedure to test the hypothesis that Americans listen to radio an average of 200 minutes a day?

What kinds of questions can you answer using a paired-samples t test?

Which would be an appropriate statistical procedure to test the hypothesis that, on average, Democrats listen to more radio than Republicans?

Paired-samples t tests compare means for how many variables for how many groups of cases?

Your independent-samples t test research hypothesis is that, when asked the ideal number of children to have, men report a higher average than women. The following results are consistent with the _ and you proceed to _.

Introduction

Data Sets

Frequency Tables and Univariate Charts

Central Tendency and Dispersion

Creating New Variables

Comparing Group Means

Crosstab Tables

Nominal and Ordinal Measures of Association

Pearsons Correlation and Bivariate Regression

Multiple Regression

Sampling Distributions and Normal Distributions

Hypothesis Testing and One-Sample T Tests

Analysis of Variance

Chi-Square

Hypothesis Testing With Measures of Association and Regression

Filters

Exam 13: Paired and Independent-Samples T Tests

What is the largest risk of making a Type I error that social scientists will usually take?

You are doing a two-tailed paired-samples t test and your results are statistically significant. The phrase "statistical significance" means the same as which of the following?

When does a researcher risk making a Type II error?

Independent-samples t tests compare means for how many variables for how many groups of cases?

Write a research hypothesis and its companion null hypothesis that could be tested with an independent-samples t test.

You are testing a two-tailed hypothesis. Your SPSS output tells you that the two-tailed significance level of a particular t statistic is .01. What is the probability of making a Type I error if you reject the null hypothesis?

If the mean IQ of a sample of right-handed persons is significantly higher than the mean IQ of a sample of left-handed persons, then which of the following must be true?

Whenever you reject a null hypothesis, you may be making a correct decision or you may be making a Type ___ error; whenever you do not reject a null hypothesis, you may be making a correct decision or you may be making a Type _____ error.

What kinds of questions can you answer using an independent-samples t test?

For an independent-samples t test, the grouping variable (the variable whose attributes are used to identify the two groups to be compared) can be what level of measurement?

Without computing any new variables, which would be an appropriate statistical procedure to test the hypothesis that, on average, college students listen to less radio than they did when they were high school students?

Which would be an appropriate statistical procedure to test the hypothesis that Americans listen to radio an average of 200 minutes a day?

What kinds of questions can you answer using a paired-samples t test?

Which would be an appropriate statistical procedure to test the hypothesis that, on average, Democrats listen to more radio than Republicans?

Paired-samples t tests compare means for how many variables for how many groups of cases?

Your independent-samples t test research hypothesis is that, when asked the ideal number of children to have, men report a higher average than women. The following results are consistent with the _____ and you proceed to _____.

Introduction

Data Sets

Frequency Tables and Univariate Charts

Central Tendency and Dispersion

Creating New Variables

Comparing Group Means

Crosstab Tables

Nominal and Ordinal Measures of Association

Pearsons Correlation and Bivariate Regression

Multiple Regression

Sampling Distributions and Normal Distributions

Hypothesis Testing and One-Sample T Tests

Analysis of Variance

Chi-Square

Hypothesis Testing With Measures of Association and Regression

Filters

Whenever you reject a null hypothesis, you may be making a correct decision or you may be making a Type _ error; whenever you do not reject a null hypothesis, you may be making a correct decision or you may be making a Type ___ error.

Your independent-samples t test research hypothesis is that, when asked the ideal number of children to have, men report a higher average than women. The following results are consistent with the _ and you proceed to _.