Question 1

Why might a spearman correlation be appropriate for a given dataset?

Accepted Answer

A)  The data are on a ratio scale 
B)  The sample size is too large 
C)  The sample is skewed with a small sample size 
D)  The data are on a nominal scale 
A)  The data are on a ratio scale 
B)  The sample size is too large 
C)  The sample is skewed with a small sample size 
D)  The data are on a nominal scale

Question 2

If using a two-tailed spearman correlation with 10 pairs and an alpha level of .05, what is the critical value?

Accepted Answer

A)  .745 
B)  .700 
C)  .564 
D)  .648 
A)  .745 
B)  .700 
C)  .564 
D)  .648

Question 3

A researcher hypothesizes that individuals' interest in politics is related to the amount of television they watch. He asks participants to rate on a scale from 1 (not interested at all) to 10 (extremely interested) the extent to which they are interested in politics, and also asks for the amount of television they watch. Below are the data
 $$\begin{array} { c c } 
\hline \text { Interest } & \text { TV } \
\hline 6 & 45 \
5 & 79 \
7 & 110 \
7 & 75 \
9 & 163 \
3 & 60 \
4 & 85 \
1 & 64 \
7 & 80 \
2 & 30 \
8 & 40 \
9 & 90 \
3 & 120 \
5 & 90 \
\hline
\end{array}$$ What is the conclusion?

Accepted Answer

The correl

Question 4

With regards to skewed distributions, which best describes them?

Accepted Answer

A)  There are two types of skewed distribution, and if a dataset is heavily skewed enough, parametric tests are not suitable for it. 
B)  There are two types of skewed distributions, and skewed data can be on interval, ratio, or ordinal scales 
C)  Skewed data are ranked or qualitative, making it unsuitable for parametric analyses 
D)  Skewed data do not pose issues for parametric tests, but are not suitable for nonparametric tests. 
A)  There are two types of skewed distribution, and if a dataset is heavily skewed enough, parametric tests are not suitable for it. 
B)  There are two types of skewed distributions, and skewed data can be on interval, ratio, or ordinal scales 
C)  Skewed data are ranked or qualitative, making it unsuitable for parametric analyses 
D)  Skewed data do not pose issues for parametric tests, but are not suitable for nonparametric tests.

Question 5

A researcher has 16 matched pairs for a Wilcoxon Signed-Rank test. For this two-tailed Wilcoxon Signed-Rank test to be significant at $\alpha$ = .05, the test statistic must be…

Accepted Answer

A)  greater than 30 
B)  less than 30 
C)  greater than 25 
D)  less than 25 
A)  greater than 30 
B)  less than 30 
C)  greater than 25 
D)  less than 25

Question 6

A researcher hypothesizes that individuals' interest in politics is related to the amount of television they watch. He asks participants to rate on a scale from 1 (not interested at all) to 10 (extremely interested) the extent to which they are interested in politics, and also asks for the amount of television they watch. Below are the data
 $$\begin{array} { c c } 
\hline \text { Interest } & \text { TV } \
\hline 6 & 45 \
5 & 79 \
7 & 110 \
7 & 75 \
9 & 163 \
3 & 60 \
4 & 85 \
1 & 64 \
7 & 80 \
2 & 30 \
8 & 40 \
9 & 90 \
3 & 120 \
5 & 90 \
\hline
\end{array}$$ What is the critical value, assuming a two-tailed test and alpha of .05?

Accepted Answer

The answer of A researcher hypothesizes that individuals' interest in...

Question 7

The data below that records the number of inches of snowfall in different parts of the country
 $\begin{array}{llcc}
\hline Score \
\hline 22\
24\
26\
47\
52\
36\
44\
26\
35\
59\
21\
\hline
\end{array}$
 Rank the data.

Accepted Answer

The answer of The data below that records the number...

Question 8

Ranked data is best described to be on an ordinal scale.

Accepted Answer

A) True 
 B)False

Question 9

Explain why non-parametric tests are important. Be sure to discuss when they are used, and any important controversies that might influence their use.

Accepted Answer

Non-parametric tests are important becau

Question 10

A researcher hypothesizes that individuals' interest in politics is related to the amount of television they watch. He asks participants to rate on a scale from 1 (not interested at all) to 10 (extremely interested) the extent to which they are interested in politics, and also asks for the amount of television they watch. Below are the data
 $$\begin{array} { c c } 
\hline \text { Interest } & \text { TV } \
\hline 6 & 45 \
5 & 79 \
7 & 110 \
7 & 75 \
9 & 163 \
3 & 60 \
4 & 85 \
1 & 64 \
7 & 80 \
2 & 30 \
8 & 40 \
9 & 90 \
3 & 120 \
5 & 90 \
\hline
\end{array}$$ What is the observed correlation?

Accepted Answer

The answer of A researcher hypothesizes that individuals' interest in...

Question 11

The null hypothesis for a Mann-Whitney U-test states that the distributions of ranked data for both groups are different.

Accepted Answer

A) True 
 B)False

Question 12

Supporters of eugenics would likely agree that…

Accepted Answer

A)  intelligence is developed via environmental influences 
B)  intelligence is inherited 
C)  intelligence cannot be measured objectively 
D)  None of the above. 
A)  intelligence is developed via environmental influences 
B)  intelligence is inherited 
C)  intelligence cannot be measured objectively 
D)  None of the above.

Question 13

The Wilcoxon Signed-Rank test produces a t value. If the observed t -value is greater than the critical value, then the results are deemed to be statistically significant.

Accepted Answer

A) True 
 B)False

Question 14

A researcher has two independent groups with ranked data with 20 participants in each group. When using a Mann-Whitney U test (assume assuming α = 0.05), the researcher has data that is statistically significant if…

Accepted Answer

A)  the U statistic is less than 127 
B)  the U statistic is greater than 127 
C)  the U statistic is less than 113 
D)  The U statistic is greater than 113 
A)  the U statistic is less than 127 
B)  the U statistic is greater than 127 
C)  the U statistic is less than 113 
D)  The U statistic is greater than 113

Question 15

Why is it the case that skewed data poses a problem for parametric tests?

Accepted Answer

A)  There mean is larger than the median. 
B)  The assumption of normality is violated. 
C)  The data does not represent the population. 
D)  The assumption of independence is violated. 
A)  There mean is larger than the median. 
B)  The assumption of normality is violated. 
C)  The data does not represent the population. 
D)  The assumption of independence is violated.

Question 16

Consider the following data: 6, 8, 10, 10, 10, 11, 12, 15, 18, 18, 19, 20, 24, 25. The data in rank 4 is ___ and rank 11 is ____.

Accepted Answer

A)  10; 19 
B)  12; 19 
C)  10; 20 
D)  12; 20 
A)  10; 19 
B)  12; 19 
C)  10; 20 
D)  12; 20

Question 17

In 2017, Nintendo (a Japanese video game company) released a new console called the Nintendo Switch. Nintendo was interested to see how existing customers with their previous generation console (i.e., the Wii U) rate the new product. Below are data of individuals who rated the first console and now rated the Nintendo Switch. Nintendo decided that given the small sample and ranked data, they would use a Wilcoxon Ranked-Sign test.
 $\begin{array}{cc}
\hline\text { Wii U } & \text { Switch } \
\hline 7 & 8 \
5 & 9 \
6 & 7 \
4 & 2 \
8 & 6 \
9 & 10 \
2 & 9 \
4 & 8 \
7 & 9 \
7 & 8 \
\hline
\end{array}$ What is the test statistic after calculating the Wilcoxon Signed Rank test?

Accepted Answer

The answer of In 2017, Nintendo (a Japanese video game...

Question 18

Statistics can be manipulated for the author's benefit, so sometimes we must be careful how must we trust them.

Accepted Answer

A) True 
 B)False

Why might a spearman correlation be appropriate for a given dataset?

If using a two-tailed spearman correlation with 10 pairs and an alpha level of .05, what is the critical value?

With regards to skewed distributions, which best describes them?

A researcher has 16 matched pairs for a Wilcoxon Signed-Rank test. For this two-tailed Wilcoxon Signed-Rank test to be significant at $\alpha$ = .05, the test statistic must be…

The data below that records the number of inches of snowfall in different parts of the country Score 22 24 26 47 52 36 44 26 35 59 21 Rank the data.

Ranked data is best described to be on an ordinal scale.

Explain why non-parametric tests are important. Be sure to discuss when they are used, and any important controversies that might influence their use.

The null hypothesis for a Mann-Whitney U-test states that the distributions of ranked data for both groups are different.

Supporters of eugenics would likely agree that…

The Wilcoxon Signed-Rank test produces a t value. If the observed t -value is greater than the critical value, then the results are deemed to be statistically significant.

A researcher has two independent groups with ranked data with 20 participants in each group. When using a Mann-Whitney U test (assume assuming α = 0.05), the researcher has data that is statistically significant if…

Why is it the case that skewed data poses a problem for parametric tests?

Consider the following data: 6, 8, 10, 10, 10, 11, 12, 15, 18, 18, 19, 20, 24, 25. The data in rank 4 is _ and rank 11 is __.

Statistics can be manipulated for the author's benefit, so sometimes we must be careful how must we trust them.

Introduction: Statistics--Who Needs Them

Types of Data

A Picture Is Worth a Thousand Words: Creating and Interpreting Graphics

Measures of Central Tendency: Whats so Average About the Mean

Variability: the Law of Life

Where Am I Normal Distributions and Standard Scores

Basic Probability Theory

The Central Limit Theorem and Hypothesis Testing

The Z-Test

The T-Test

Analysis of Variance

Confidence Intervals and Effect Size: Building a Better Mousetrap

Correlation and Regression: Are We Related

The Chi-Square Test

Which Test Should I Use and Why

Filters

Exam 15: Non-Parametric Tests

Why might a spearman correlation be appropriate for a given dataset?

If using a two-tailed spearman correlation with 10 pairs and an alpha level of .05, what is the critical value?

With regards to skewed distributions, which best describes them?

A researcher has 16 matched pairs for a Wilcoxon Signed-Rank test. For this two-tailed Wilcoxon Signed-Rank test to be significant at α\alphaα = .05, the test statistic must be…

The data below that records the number of inches of snowfall in different parts of the country Score 22 24 26 47 52 36 44 26 35 59 21 Rank the data.

Ranked data is best described to be on an ordinal scale.

Explain why non-parametric tests are important. Be sure to discuss when they are used, and any important controversies that might influence their use.

The null hypothesis for a Mann-Whitney U-test states that the distributions of ranked data for both groups are different.

Supporters of eugenics would likely agree that…

The Wilcoxon Signed-Rank test produces a t value. If the observed t -value is greater than the critical value, then the results are deemed to be statistically significant.

A researcher has two independent groups with ranked data with 20 participants in each group. When using a Mann-Whitney U test (assume assuming α = 0.05), the researcher has data that is statistically significant if…

Why is it the case that skewed data poses a problem for parametric tests?

Consider the following data: 6, 8, 10, 10, 10, 11, 12, 15, 18, 18, 19, 20, 24, 25. The data in rank 4 is ___ and rank 11 is ____.

Statistics can be manipulated for the author's benefit, so sometimes we must be careful how must we trust them.

Introduction: Statistics--Who Needs Them

Types of Data

A Picture Is Worth a Thousand Words: Creating and Interpreting Graphics

Measures of Central Tendency: Whats so Average About the Mean

Variability: the Law of Life

Where Am I Normal Distributions and Standard Scores

Basic Probability Theory

The Central Limit Theorem and Hypothesis Testing

The Z-Test

The T-Test

Analysis of Variance

Confidence Intervals and Effect Size: Building a Better Mousetrap

Correlation and Regression: Are We Related

The Chi-Square Test

Which Test Should I Use and Why

Filters

A researcher has 16 matched pairs for a Wilcoxon Signed-Rank test. For this two-tailed Wilcoxon Signed-Rank test to be significant at $\alpha$ = .05, the test statistic must be…

Consider the following data: 6, 8, 10, 10, 10, 11, 12, 15, 18, 18, 19, 20, 24, 25. The data in rank 4 is _ and rank 11 is __.