Question 1

A value of d such as 0.50 indicates a medium effect size.

Accepted Answer

A) True 
 B)False

Question 2

Data Set 10-8: Drugs that reduce emotionality make big money for drug companies. These drugs undergo extensive testing, some of which is done with animals. One common test of emotionality in rats is the number of fecal boluses that are dropped when an animal is left for 10 minutes in an open field (a 4' x 4' space). Greater emotionality is indicated by more boluses. Imagine that two drugs, aloe and vera were compared. Five rats were given aloe and five were given vera. The numbers below represent the number of boluses dropped in the open field. $$\begin{array} { r l } 
\text { Aloe } & \text { Vera } \
\hline 4 & 2 \
12 & 9 \
7 & 6 \
10 & 7 \
6 & 4
\end{array}$$
-The proper conclusion from Data Set 10-8 is that

Accepted Answer

A)  aloe reduces emotionality more than vera 
B)  vera reduces emotionality more than aloe 
C)  there is no significant difference in the effect of the two drugs on emotionality 
D)  there is a significant change in emotionality, but the direction cannot be determined. 
A)  aloe reduces emotionality more than vera 
B)  vera reduces emotionality more than aloe 
C)  there is no significant difference in the effect of the two drugs on emotionality 
D)  there is a significant change in emotionality, but the direction cannot be determined.

Question 3

The most general rule that governs degrees of freedom is that

Accepted Answer

A)  df = N-1 
B)  df = $\Sigma$(X - $\bar { X }$ )2 
C)  degrees of freedom depend on the $\alpha$level 
D)  degrees of freedom depend on the number of observations minus the number of parameters estimated with statistics. 
A)  df = N-1 
B)  df = $\Sigma$(X - $\bar { X }$ )2 
C)  degrees of freedom depend on the $\alpha$level 
D)  degrees of freedom depend on the number of observations minus the number of parameters estimated with statistics.

Question 4

Data Set 10-7: In that long standing feud between the Hatfields and the McCoys, Old Doc Sawbones has been keeping score. During the last 16 years he noted in his feudian notebook a "degree of injury"
measure each time he patched up, sewed up, or made a coroner's report on anyone in the two families. Summary statistics were:
 $$\begin{array} { c c c } 
& \text { Hatfields } & \text { McCoys } \
\bar { X } & 41 & 34 \
\hat { S } & 6 & 8 \
N & 16 & 16
\end{array}$$
-The effect size index for Data Set 10-7 is

Accepted Answer

A)  0.70 
B)  0.99 
C)  1.40 
A)  0.70 
B)  0.99 
C)  1.40

Question 5

Identify each experiment below as an independent samples design or a paired samples design.
-At a hunting club the squirrel hunters had a contest with the quail hunters to see who could hit the most moving targets.

Accepted Answer

A)  independent 
B)  paired 
A)  independent 
B)  paired

Question 6

Which of the following is not an example of the null hypothesis?

Accepted Answer

A)  $\mu$1 $\neq$$\mu$2. 
B)  $\mu$1 $\neq$$\mu$2.. 
C)  $\mu$1 $\neq$$\mu$2 
D)  all of the other alternatives are correct.. 
A)  $\mu$1 $\neq$$\mu$2. 
B)  $\mu$1 $\neq$$\mu$2.. 
C)  $\mu$1 $\neq$$\mu$2 
D)  all of the other alternatives are correct..

Question 7

In statistics, a researcher may find that a difference between means could not reasonably be attributed to chance. In statistics, such a difference is clearly

Accepted Answer

A)  significant 
B)  important 
C)  both of the descriptive alternatives are correct 
D)  neither of the descriptive alternatives is correct. 
A)  significant 
B)  important 
C)  both of the descriptive alternatives are correct 
D)  neither of the descriptive alternatives is correct.

Question 8

Which of the following would qualify as a small effect size index?

Accepted Answer

A)  a negative number 
B)  1.96 
C)  2.00 to 3.00 
D)  none of the descriptive alternatives are correct. 
A)  a negative number 
B)  1.96 
C)  2.00 to 3.00 
D)  none of the descriptive alternatives are correct.

Question 9

Data Set 10-1: A college teacher was assigned 4 freshmen advisees. He administered an attitude scale that measured liberalism-conservatism. Four years later, just before graduation, all 4 took the same scale again. High scores indicate conservative attitude. The following scores were obtained.
 $$\begin{array} { c c } 
2006 & 2010 \
\hline 26 & 15 \
22 & 23 \
17 & 14 \
15 & 10
\end{array}$$
-The proper conclusion for the experiment described in Data Set 10-1 is

Accepted Answer

A)  there was a significant shift in attitudes from conservative to liberal (p < .05) 
B)  there was a significant shift in attitudes from liberal to conservative (p < .05) 
C)  there was no significant shift in attitudes. 
A)  there was a significant shift in attitudes from conservative to liberal (p < .05) 
B)  there was a significant shift in attitudes from liberal to conservative (p < .05) 
C)  there was no significant shift in attitudes.

Question 10

Data Set 10-2: The IQs of a group of special education students were compared to the IQs of their siblings who were not in special education. The following data were obtained.
 $$\begin{array} { c c } 
\text { Special Ed } & \text { Not Special Ed } \
\hline 70 & 104 \
65 & 99 \
67 & 95
\end{array}$$
-The conclusion from Data Set 10-2 is that those in special education

Accepted Answer

A)  have significantly lower IQs than those not in special education 
B)  have significantly higher IQs than those not in special education 
C)  are not significantly different in IQ than those not in special education. 
A)  have significantly lower IQs than those not in special education 
B)  have significantly higher IQs than those not in special education 
C)  are not significantly different in IQ than those not in special education.

Question 11

Data Set 10-8: Drugs that reduce emotionality make big money for drug companies. These drugs undergo extensive testing, some of which is done with animals. One common test of emotionality in rats is the number of fecal boluses that are dropped when an animal is left for 10 minutes in an open field (a 4' x 4' space). Greater emotionality is indicated by more boluses. Imagine that two drugs, aloe and vera were compared. Five rats were given aloe and five were given vera. The numbers below represent the number of boluses dropped in the open field. $$\begin{array} { r l } 
\text { Aloe } & \text { Vera } \
\hline 4 & 2 \
12 & 9 \
7 & 6 \
10 & 7 \
6 & 4
\end{array}$$
-The standard error of difference for Data Set 10-8 is

Accepted Answer

A)  0.374 
B)  0.837 
C)  1.871 
D)  3.50 
A)  0.374 
B)  0.837 
C)  1.871 
D)  3.50

Question 12

Half the participants were given 15 mg of the drug and half received the placebo. Scores are reaction-time scores (.01 sec x 100). Perform a t test, find d, and interpret the results.Independent variable___________Dependent variable___________ $$\begin{array} { r r } 
15 \mathrm { mg } & \text { Placebo } \
\hline 25 & 21 \
26 & 20 \
20 & 18 \
27 & 24
\end{array}$$

Accepted Answer

No significant diffe

Question 13

Which of the following is important in determining whether you will reject the null hypothesis?

Accepted Answer

A)  the size of the rejection region 
B)  difference between the two population means 
C)  the size of the sample size 
D)  all of the descriptive alternatives are correct. 
A)  the size of the rejection region 
B)  difference between the two population means 
C)  the size of the sample size 
D)  all of the descriptive alternatives are correct.

Question 14

The standard error of a difference, calculated from samples, is a

Accepted Answer

A)  mean 
B)  standard deviation 
C)  correlation coefficient 
D)  parameter. 
A)  mean 
B)  standard deviation 
C)  correlation coefficient 
D)  parameter.

Question 15

Determining whether there is a logical reason to pair two scores in a two-sample experiment is necessary in deciding whether

Accepted Answer

A)  to use a one-tailed or two-tailed test 
B)  the design is a paired-samples or an independent-samples design 
C)  to use hypothesis testing or confidence intervals 
D)  all of the descriptive alternatives are correct. 
A)  to use a one-tailed or two-tailed test 
B)  the design is a paired-samples or an independent-samples design 
C)  to use hypothesis testing or confidence intervals 
D)  all of the descriptive alternatives are correct.

Question 16

The top speed was obtained for five cars with and for five other cars without STP gas treatment. Use a t test to find the effect of STP on speed.Independent variable___________Dependent variable___________ $$\begin{array} { r c } 
\text { With } & \text { Without } \
\hline 140 & 138 \
80 & 85 \
88 & 90 \
85 & 80 \
110 & 120
\end{array}$$

Accepted Answer

No significant diffe

Question 17

The rule that governs degrees of freedom is that

Accepted Answer

A)  df = N - 1 
B)  df = $\Sigma$(X - $\bar { X }$ )2 
C)  df depends on the $\alpha$ level 
D)  df depends on the number of observations minus the number of parameters estimated with statistics. 
A)  df = N - 1 
B)  df = $\Sigma$(X - $\bar { X }$ )2 
C)  df depends on the $\alpha$ level 
D)  df depends on the number of observations minus the number of parameters estimated with statistics.

Question 18

Your text says that the best way to increase the power of statistical tests is to

Accepted Answer

A)  adopt a large$\alpha$ level 
B)  do your arithmetic twice 
C)  use large N's 
D)  all of the descriptive alternatives are correct. 
A)  adopt a large$\alpha$ level 
B)  do your arithmetic twice 
C)  use large N's 
D)  all of the descriptive alternatives are correct.

Question 19

Identify the design of each experiment below as paired samples or independent samples. In each case give the df.
-A comparison of 54 electricians to 54 plumbers who were all union members, 25-40 years old, showed no significant difference in spatial abilities.

Accepted Answer

Independen

Question 20

Normally distributed populations with equal variances are most likely to give accurate p values for a t test.

Accepted Answer

A) True 
 B)False

A value of d such as 0.50 indicates a medium effect size.

The most general rule that governs degrees of freedom is that

Identify each experiment below as an independent samples design or a paired samples design. -At a hunting club the squirrel hunters had a contest with the quail hunters to see who could hit the most moving targets.

Which of the following is not an example of the null hypothesis?

In statistics, a researcher may find that a difference between means could not reasonably be attributed to chance. In statistics, such a difference is clearly

Which of the following would qualify as a small effect size index?

Data Set 10-2: The IQs of a group of special education students were compared to the IQs of their siblings who were not in special education. The following data were obtained. Special Ed Not Special Ed 70 104 65 99 67 95 -The conclusion from Data Set 10-2 is that those in special education

Half the participants were given 15 mg of the drug and half received the placebo. Scores are reaction-time scores (.01 sec x 100). Perform a t test, find d, and interpret the results.Independent variable_Dependent variable_ 15 Placebo 25 21 26 20 20 18 27 24

Which of the following is important in determining whether you will reject the null hypothesis?

The standard error of a difference, calculated from samples, is a

Determining whether there is a logical reason to pair two scores in a two-sample experiment is necessary in deciding whether

The top speed was obtained for five cars with and for five other cars without STP gas treatment. Use a t test to find the effect of STP on speed.Independent variable_Dependent variable_ With Without 140 138 80 85 88 90 85 80 110 120

The rule that governs degrees of freedom is that

Your text says that the best way to increase the power of statistical tests is to

Identify the design of each experiment below as paired samples or independent samples. In each case give the df. -A comparison of 54 electricians to 54 plumbers who were all union members, 25-40 years old, showed no significant difference in spatial abilities.

Normally distributed populations with equal variances are most likely to give accurate p values for a t test.

Introduction

Exploring Data: Frequency Distributions and Graphs

Exploring Data: Central Tendency

Exploring Data: Variability

Other Descriptive Statistics

Correlation and Regression

Theoretical Distributions Including the Normal Distribution

Samples, Sampling Distributions, and Confidence Intervals

Hypothesis Testing and Effect Size: One-Sample Designs

Analysis of Variance: One-Way Classification

Analysis of Variance: One-Factor Repeated Measures

Analysis of Variance: Factorial Design

Chi Square Tests

More Nonparametric Tests

Appendix: Grouped Frequency Distributions and Central Tendency

Filters

Exam 10: Hypothesis Testing, Effect Size, and and Confidence Intervals: Two-Sample Designs

A value of d such as 0.50 indicates a medium effect size.

The most general rule that governs degrees of freedom is that

Identify each experiment below as an independent samples design or a paired samples design. -At a hunting club the squirrel hunters had a contest with the quail hunters to see who could hit the most moving targets.

Which of the following is not an example of the null hypothesis?

In statistics, a researcher may find that a difference between means could not reasonably be attributed to chance. In statistics, such a difference is clearly

Which of the following would qualify as a small effect size index?

Data Set 10-2: The IQs of a group of special education students were compared to the IQs of their siblings who were not in special education. The following data were obtained. Special Ed Not Special Ed 70 104 65 99 67 95 -The conclusion from Data Set 10-2 is that those in special education

Half the participants were given 15 mg of the drug and half received the placebo. Scores are reaction-time scores (.01 sec x 100). Perform a t test, find d, and interpret the results.Independent variable___________Dependent variable___________ 15 Placebo 25 21 26 20 20 18 27 24

Which of the following is important in determining whether you will reject the null hypothesis?

The standard error of a difference, calculated from samples, is a

Determining whether there is a logical reason to pair two scores in a two-sample experiment is necessary in deciding whether

The top speed was obtained for five cars with and for five other cars without STP gas treatment. Use a t test to find the effect of STP on speed.Independent variable___________Dependent variable___________ With Without 140 138 80 85 88 90 85 80 110 120

The rule that governs degrees of freedom is that

Your text says that the best way to increase the power of statistical tests is to

Identify the design of each experiment below as paired samples or independent samples. In each case give the df. -A comparison of 54 electricians to 54 plumbers who were all union members, 25-40 years old, showed no significant difference in spatial abilities.

Normally distributed populations with equal variances are most likely to give accurate p values for a t test.

Introduction

Exploring Data: Frequency Distributions and Graphs

Exploring Data: Central Tendency

Exploring Data: Variability

Other Descriptive Statistics

Correlation and Regression

Theoretical Distributions Including the Normal Distribution

Samples, Sampling Distributions, and Confidence Intervals

Hypothesis Testing and Effect Size: One-Sample Designs

Analysis of Variance: One-Way Classification

Analysis of Variance: One-Factor Repeated Measures

Analysis of Variance: Factorial Design

Chi Square Tests

More Nonparametric Tests

Appendix: Grouped Frequency Distributions and Central Tendency

Filters

Half the participants were given 15 mg of the drug and half received the placebo. Scores are reaction-time scores (.01 sec x 100). Perform a t test, find d, and interpret the results.Independent variable_Dependent variable_ 15 Placebo 25 21 26 20 20 18 27 24

The top speed was obtained for five cars with and for five other cars without STP gas treatment. Use a t test to find the effect of STP on speed.Independent variable_Dependent variable_ With Without 140 138 80 85 88 90 85 80 110 120