Question 1

The Wilcoxon test was used on 18 pairs of data.The total of the ranks (T)were computed to be 111 (for + ranks)and 60 (for - ranks).The z value for this test is ____.

Accepted Answer

A) -1.11 
B) -0.05 
C) -0.07 
D) 0.033 
E) 2.22 
A) -1.11 
B) -0.05 
C) -0.07 
D) 0.033 
E) 2.22

Question 2

A quality control supervisor wishes to determine whether the following measurements are random: $$\begin{array}{l}
\begin{array} { r r r r r r r r } 
68.2 & 65 & 66.5 & 65 & 67.5 & 68 & 66 & 64.5 \
65.3 & 64.2 & 67.6 & 66.5 & 66.8 & 68.9 & 67 & 65 \
\hline\
\end{array}\
\begin{array} { r r r r r r r | } 
\hline 65 & 67 & 68 & 71 & 68.5 & 63.6 & 64.7 \
71.5 & 70.7 & 66 & 68.5 & 70.5 & 69.5 & 70.1 \
\hline
\end{array}
\end{array}$$ For this purpose, the supervisor uses a previous median of 67.9 and compares each measurement to that median to perform a runs test.She uses a significance level of 0.05.This is a ______ test.

Accepted Answer

A) right-tailed 
B) forward-tailed 
C) two-tailed 
D) inside-tailed 
E) left-tailed 
A) right-tailed 
B) forward-tailed 
C) two-tailed 
D) inside-tailed 
E) left-tailed

Question 3

Prior to computing a Friedman test, the data are ranked within each block from smallest to largest.

Accepted Answer

A) True 
 B)False

Question 4

Two stock analysts rank five investment portfolios for overall performance and risk. $\begin{array}{c}
\quad\quad\quad\quad\quad\quad\quad\text {Portfolio}\
\quad \quad\quad\quad \quad\quad\quad\quad \quad A\quad B\quad C\quad D\quad E\

\begin{array}{|l|l|l|l|l|l|}
\hline \text { Broker 1 - Rankings } & 4 & 5 & 2 & 1 & 3 \
\hline \text { Broker 2 - Rankings } & 1 & 4 & 3 & 2 & 5 \
\hline
\end{array}\end{array}$
 Using these rankings, the Spearman rank correlation coefficient is ___________.

Accepted Answer

A) 0.80 
B) 0.20 
C) 0.05 
D) 0.95 
E) 1.00 
A) 0.80 
B) 0.20 
C) 0.05 
D) 0.95 
E) 1.00

Question 5

A researcher wants to study the effects of physical exercise on depression.She randomly selects a group of 24 individuals who are equally depressed.None of these individuals currently exercises.She then randomly assigns them in one of three groups: group 1 stays without exercising (sedentary group), group 2 exercises once a week, and group 3 exercises two times a week.Individuals in groups 2 and 3 meet with a personal trainer so they carry out a very similar exercising program, both in kinds of exercises and in intensity.After two months, the researcher has all individuals take a depression-assessment test.The score of the test goes from 0 = totally miserable to 100 = complete satisfaction. The scores are shown in the following table:
$$\begin{array} { | c c c | } 
\hline \text { Group 1 } & \text { Group 2 } & \text { Group } 3 \
\hline 25 & 24 & 35 \
15 & 16 & 22 \
20 & 19 & 31 \
17 & 24 & 32 \
23 & 25 & 31 \
21 & 25 & 29 \
19 & 21 & 33 \
18 & 18 & 35 \
\hline
\end{array}$$ The researcher uses a Kruskal-Wallis test and a significance level $\alpha$ = 0.05.The observed K statistic is ______.

Accepted Answer

A) 10.16625 
B) 10.7525 
C) 11.16625 
D) 12.7525 
E) 13.16625 
A) 10.16625 
B) 10.7525 
C) 11.16625 
D) 12.7525 
E) 13.16625

Question 6

The methods of parametric statistics can be applied to nominal or ordinal data.

Accepted Answer

A) True 
 B)False

Question 7

The appropriate test for comparing the medians of two populations using ordinal-level data from two related samples is the Wilcoxon test.

Accepted Answer

A) True 
 B)False

Question 8

Which of the following tests should be used to compare the means of two populations if the samples are independent?

Accepted Answer

A) Mann-Whitney test 
B) Wilcoxon test 
C) Runs test 
D) Spearman's test 
E) Kruskal-Wallis test 
A) Mann-Whitney test 
B) Wilcoxon test 
C) Runs test 
D) Spearman's test 
E) Kruskal-Wallis test

Question 9

Statistical techniques based on fewer assumptions about the population and the parameters are called _______.

Accepted Answer

A) population statistics 
B) parametric statistics 
C) nonparametric statistics 
D) chi-square statistics 
E) correlation statistics 
A) population statistics 
B) parametric statistics 
C) nonparametric statistics 
D) chi-square statistics 
E) correlation statistics

Question 10

The alternative hypothesis for the Friedman test is that at least one treatment is different from at least one other treatment.

Accepted Answer

A) True 
 B)False

The Wilcoxon test was used on 18 pairs of data.The total of the ranks (T)were computed to be 111 (for + ranks)and 60 (for - ranks).The z value for this test is ____.

Prior to computing a Friedman test, the data are ranked within each block from smallest to largest.

Two stock analysts rank five investment portfolios for overall performance and risk. Portfolio ABCDE Broker 1 - Rankings 4 5 2 1 3 Broker 2 - Rankings 1 4 3 2 5 Using these rankings, the Spearman rank correlation coefficient is ___________.

The methods of parametric statistics can be applied to nominal or ordinal data.

The appropriate test for comparing the medians of two populations using ordinal-level data from two related samples is the Wilcoxon test.

Which of the following tests should be used to compare the means of two populations if the samples are independent?

Statistical techniques based on fewer assumptions about the population and the parameters are called _______.

The alternative hypothesis for the Friedman test is that at least one treatment is different from at least one other treatment.

Introduction to Statistics and Business Analytics

Visualizing Data With Charts and Graphs

Descriptive Statistics

Probability

Discrete Distributions

Continuous Distributions

Sampling and Sampling Distributions

Statistical Inference: Estimation for Single Populations

Statistical Inference: Hypothesis Testing for Single Populations

Statistical Inferences About Two Populations

Analysis of Variance and Design of Experiments

Simple Regression Analysis and Correlation

Multiple Regression Analysis

Building Multiple Regression Models

Time-Series Forecasting and Index Numbers

Analysis of Categorical Data

Statistical Quality Control

Decision Analysis

Filters

Exam 17: Nonparametric Statistics

The Wilcoxon test was used on 18 pairs of data.The total of the ranks (T)were computed to be 111 (for + ranks)and 60 (for - ranks).The z value for this test is ____.

Prior to computing a Friedman test, the data are ranked within each block from smallest to largest.

Two stock analysts rank five investment portfolios for overall performance and risk. Portfolio ABCDE Broker 1 - Rankings 4 5 2 1 3 Broker 2 - Rankings 1 4 3 2 5 Using these rankings, the Spearman rank correlation coefficient is ___________.

The methods of parametric statistics can be applied to nominal or ordinal data.

The appropriate test for comparing the medians of two populations using ordinal-level data from two related samples is the Wilcoxon test.

Which of the following tests should be used to compare the means of two populations if the samples are independent?

Statistical techniques based on fewer assumptions about the population and the parameters are called _______.

The alternative hypothesis for the Friedman test is that at least one treatment is different from at least one other treatment.

Introduction to Statistics and Business Analytics

Visualizing Data With Charts and Graphs

Descriptive Statistics

Probability

Discrete Distributions

Continuous Distributions

Sampling and Sampling Distributions

Statistical Inference: Estimation for Single Populations

Statistical Inference: Hypothesis Testing for Single Populations

Statistical Inferences About Two Populations

Analysis of Variance and Design of Experiments

Simple Regression Analysis and Correlation

Multiple Regression Analysis

Building Multiple Regression Models

Time-Series Forecasting and Index Numbers

Analysis of Categorical Data

Statistical Quality Control

Decision Analysis

Filters