Question 1

The Friedman test is always one tailed.The inequality sign in the alternative hypothesis is always ____________________.

Accepted Answer

The answer of The Friedman test is always one tailed.The...

Question 2

When the relationship between two variables is very strong and decreasing in a linear way,the Spearman rank-correlation coefficient will be close to:

Accepted Answer

A)  0 
B)  -1 
C)  $\rho$ 
D)  $\infty$ 
A)  0 
B)  -1 
C)  $\rho$ 
D)  $\infty$

Question 3

If Friedman test is applied to a data set that are generated from a randomized block experiment with 3 treatments and 5 blocks,then the rejection region at the 2.5% significance level is Fr > 12.8325.

Accepted Answer

A) True 
 B)False

Question 4

Campaign Commercials
It is important to sponsors of television shows that viewers remember as much as possible about the commercials.The campaign manager for a local politician is trying to decide which of two commercials to use on a weekly half-hour comedy.To help make a decision she decides to have 12 individuals watch both commercials.After each viewing,each respondent is given a quiz consisting of 10 questions.The number of correct responses is recorded and listed below.Assume that the quiz results are not normally distributed.
 $$\begin{array}{l}
\quad\quad\quad\quad\quad\quad\quad\quad\text { Quiz scoras }\
\begin{array} { | c | c c | } 
\hline \text { Respondent } & \text { Commercial 1 } & \text { Commercial 2 } \
\hline 1 & 7 & 9 \
2 & 8 & 9 \
3 & 6 & 6 \
4 & 10 & 10 \
5 & 5 & 4 \
6 & 7 & 9 \
7 & 5 & 7 \
8 & 4 & 5 \
9 & 6 & 8 \
10 & 7 & 9 \
11 & 5 & 6 \
12 & 8 & 10 \
\hline
\end{array}
\end{array}$$
-{Campaign Commercials Narrative} Does this data provide enough evidence at the 5% significance level to conclude that the responses to the two commercials differ?

Accepted Answer

H₀: The two population locati

Question 5

To apply the Wilcoxon rank sum test to determine whether the location of population 1 is different from the location of population 2,the samples must be:

Accepted Answer

A)  larger than 30. 
B)  independent. 
C)  drawn from normal populations. 
D)  drawn from matched pairs experiment. 
A)  larger than 30. 
B)  independent. 
C)  drawn from normal populations. 
D)  drawn from matched pairs experiment.

Question 6

In a normal approximation to the Wilcoxon rank sum test,the standardized test statistic is calculated as z = 1.80.For a two-tail test,the p-value is:

Accepted Answer

A)  0.0359 
B)  0.4641 
C)  0.2321 
D)  0.0718 
A)  0.0359 
B)  0.4641 
C)  0.2321 
D)  0.0718

Question 7

To apply the Friedman test to determine whether the locations of two or more populations are the same,the samples must be:

Accepted Answer

A)  from a randomized block experiment. 
B)  from normal populations. 
C)  independent. 
D)  All of these choices are true. 
A)  from a randomized block experiment. 
B)  from normal populations. 
C)  independent. 
D)  All of these choices are true.

Question 8

In the case of comparing two population locations,the Kruskal-Wallis test can only determine whether a difference in locations exists.To determine which population has a higher location requires the use of the Wilcoxon ____________________ test.

Accepted Answer

The answer of In the case of comparing two population...

Question 9

The first step in a Wilcoxon rank sum test is to combine the data values in the two samples and assign a rank of 1 to the:

Accepted Answer

A)  smallest observation. 
B)  middle observation. 
C)  largest observation. 
D)  observation that occurs most frequently. 
A)  smallest observation. 
B)  middle observation. 
C)  largest observation. 
D)  observation that occurs most frequently.

Question 10

Assessments of TV Shows
Because of the cost of producing television shows and the profits associated with successful shows,television network executives are keenly interested in public opinion.A network has recently developed three comedy series.The pilot of each series is shown in to 10 randomly selected people who evaluate each show on a 9-point scale where 1 = terrible and 9 = excellent.The results are shown below.
 $$\begin{array}{l}
\text { Assessments of Television Shows }\
\begin{array} { | c | c c c | } 
\hline \text { Person } & \text { Show 1 } & \text { Show 2 } & \text { Show 3 } \
\hline 1 & 6 & 4 & 7 \
2 & 5 & 4 & 5 \
3 & 7 & 6 & 8 \
4 & 7 & 7 & 8 \
5 & 9 & 9 & 9 \
6 & 5 & 7 & 6 \
7 & 4 & 4 & 5 \
8 & 6 & 3 & 7 \
9 & 5 & 6 & 6 \
10 & 7 & 7 & 8 \
\hline
\end{array}
\end{array}$$
-{Assessments of TV Shows Narrative} Can we infer at the 5% significance level that differences exist among the show's evaluations?

Accepted Answer

H₀: The locations of all three population

Question 11

The alternative hypothesis of the Kruskal-Wallis test is that ____________________ population locations differ.

Accepted Answer

at least t

Question 12

Statistical tests that are not very sensitive to errors in assumptions are called parametric tests.

Accepted Answer

A) True 
 B)False

Question 13

Movie Scripts
In general,before a producer agrees to make a movie,each script is thoroughly reviewed by movie editors.Suppose that the Big-Screen Film Company has recently received two scripts for new movies.To help them decide which one to produce,both are sent to 30 editors who rate the scripts to judge which one is better.Suppose that 10 editors rate script 1 better and 20 rate script 2 better.
-{Movie Scripts Narrative} Which test is appropriate for this situation?

Accepted Answer

The answer of Movie Scripts
In general,before a producer agrees to...

Question 14

We can use the Friedman test to determine whether two populations differ.The conclusion will be the same as that produced from the sign test.

Accepted Answer

A) True 
 B)False

Question 15

The Wilcoxon signed rank sum test is applied to compare two populations,when the samples are matched pairs and the data are interval but not normally distributed.

Accepted Answer

A) True 
 B)False

Question 16

The Kruskal-Wallis test can be conducted as one or two-tail test.

Accepted Answer

A) True 
 B)False

Question 17

When the Kruskal-Wallis test is used to test for a difference between two populations,it will produce the same outcome as the two-tail Wilcoxon ____________________ test.

Accepted Answer

The answer of When the Kruskal-Wallis test is used to...

Question 18

Which of the following statements about the Spearman rank-correlation coefficient is true?

Accepted Answer

A)  It is equal to the Pearson correlation coefficient of the ranks of the data. 
B)  The population Spearman correlation coefficient is labeled $\rho$s. 
C)  Values near +1 point to an uphill relationship between the two variables. 
D)  All of these choices are true. 
A)  It is equal to the Pearson correlation coefficient of the ranks of the data. 
B)  The population Spearman correlation coefficient is labeled $\rho$s. 
C)  Values near +1 point to an uphill relationship between the two variables. 
D)  All of these choices are true.

Question 19

The Wilcoxon rank sum test statistic T is approximately normally distributed whenever the sample sizes are larger than:

Accepted Answer

A)  25 
B)  20 
C)  15 
D)  10 
A)  25 
B)  20 
C)  15 
D)  10

Question 20

Instead of testing whether population means differ,a nonparametric technique would test whether the population ____________________ differ.

Accepted Answer

The answer of Instead of testing whether population means differ,a...

Exam 19: Nonparametric Statistics

The Friedman test is always one tailed.The inequality sign in the alternative hypothesis is always ____________________.

When the relationship between two variables is very strong and decreasing in a linear way,the Spearman rank-correlation coefficient will be close to:

If Friedman test is applied to a data set that are generated from a randomized block experiment with 3 treatments and 5 blocks,then the rejection region at the 2.5% significance level is Fr > 12.8325.

To apply the Wilcoxon rank sum test to determine whether the location of population 1 is different from the location of population 2,the samples must be:

In a normal approximation to the Wilcoxon rank sum test,the standardized test statistic is calculated as z = 1.80.For a two-tail test,the p-value is:

To apply the Friedman test to determine whether the locations of two or more populations are the same,the samples must be:

In the case of comparing two population locations,the Kruskal-Wallis test can only determine whether a difference in locations exists.To determine which population has a higher location requires the use of the Wilcoxon ____________________ test.

The first step in a Wilcoxon rank sum test is to combine the data values in the two samples and assign a rank of 1 to the:

The alternative hypothesis of the Kruskal-Wallis test is that ____________________ population locations differ.

Statistical tests that are not very sensitive to errors in assumptions are called parametric tests.

We can use the Friedman test to determine whether two populations differ.The conclusion will be the same as that produced from the sign test.

The Wilcoxon signed rank sum test is applied to compare two populations,when the samples are matched pairs and the data are interval but not normally distributed.

The Kruskal-Wallis test can be conducted as one or two-tail test.

When the Kruskal-Wallis test is used to test for a difference between two populations,it will produce the same outcome as the two-tail Wilcoxon ____________________ test.

Which of the following statements about the Spearman rank-correlation coefficient is true?

The Wilcoxon rank sum test statistic T is approximately normally distributed whenever the sample sizes are larger than:

Instead of testing whether population means differ,a nonparametric technique would test whether the population ____________________ differ.

What Is Statistics

Graphical Descriptive Techniques I

Graphical Descriptive Techniques II

A: Numerical Descriptive Techniques

B: Numerical Descriptive Techniques

C: Numerical Descriptive Techniques

Data Collection and Sampling

Probability

A: Random Variables and Discrete Probability Distributions

B: Random Variables and Discrete Probability Distributions

Continuous Probability Distributions

Sampling Distributions

Introduction to Estimation

Introduction to Hypothesis Testing

Inference About a Population

Inference About Comparing Two Populations

Analysis of Variance

Chi-Squared Tests

A: Simple Linear Regression and Correlation

B: Simple Linear Regression and Correlation

Multiple Regression

Model Building

Time-Series Analysis and Forecasting

Statistical Process Control

Decision Analysis

Conclusion

Filters

If Friedman test is applied to a data set that are generated from a randomized block experiment with 3 treatments and 5 blocks,then the rejection region at the 2.5% significance level is F_r > 12.8325.