Question 1

When two variables x and y are linearly related,it does not necessarily mean that x ____________________ y.

Accepted Answer

The answer of When two variables x and y are...

Question 2

Statisticians typically apply graphical techniques as a first step in a data analysis because we first need to know the shape of the distribution.

Accepted Answer

A) True 
 B)False

Question 3

Which of the following summary measures is affected most by extreme values?

Accepted Answer

A) The median. 
B) The mean. 
C) The range. 
D) The interquartile range. 
A) The median. 
B) The mean. 
C) The range. 
D) The interquartile range.

Question 4

The coefficient of correlation r is a number that indicates the direction and the strength of the linear relationship between the dependent variable y and the independent variable x.

Accepted Answer

A) True 
 B)False

Question 5

Assuming a linear relationship between X and Y,if the coefficient of correlation (r)equals −0.75,this means that:

Accepted Answer

A) there is very weak correlation. 
B) the slope b1 is = −0.75. 
C) the value of X is always greater than the value of Y. 
D) None of these choices are true. 
A) there is very weak correlation. 
B) the slope b1 is = −0.75. 
C) the value of X is always greater than the value of Y. 
D) None of these choices are true.

Question 6

The annual percentage rates of return over the past 10 years for two mutual funds are as shown below.Which fund would you classify as having the higher level of risk?

Accepted Answer

The variance of returns will b

Question 7

____________________ techniques give you the big picture of a distribution and ____________________ techniques give you more precise details.

Accepted Answer

Graphical;

Question 8

Which of the following statements is true?

Accepted Answer

A) The lower or first quartile is labeled Q1 and is equal to the 25th percentile. 
B) The second quartile is labeled Q2 and is equal to the median. 
C) The upper or third quartile is labeled Q3 and is equal to the 75th percentile. 
D) All of these choices are true. 
A) The lower or first quartile is labeled Q1 and is equal to the 25th percentile. 
B) The second quartile is labeled Q2 and is equal to the median. 
C) The upper or third quartile is labeled Q3 and is equal to the 75th percentile. 
D) All of these choices are true.

Question 9

What statistics and graphs can you use to answer the following question: Are the observations close to one another,or are they widely dispersed?

Accepted Answer

The standard deviation can tell you whet

Question 10

The ____________________ is the least effective of all the measures of variability.

Accepted Answer

The answer of The ____________________ is the least effective of...

Question 11

Q2 is another name for the ____________________.

Accepted Answer

Question 12

In a histogram,the proportion of the total area which must be to the right of the mean is exactly 0.50 if the distribution is symmetric and unimodal.

Accepted Answer

A) True 
 B)False

Question 13

Ages of Volunteers ​ The following data represent the ages in years of a sample of 25 volunteers from a charitable organization: 31,43,56,23,49,42,33,61,44,28,48,38,44,35,40,64,52,42,47,39,53,27,36,35, and 20. ​ ​
-{Ages of Volunteers Narrative} Compute the coefficient of variation and express the number in the appropriate unit.

Accepted Answer

cv = 11.17 years / 4

Question 14

Ages of Volunteers ​ The following data represent the ages in years of a sample of 25 volunteers from a charitable organization: 31,43,56,23,49,42,33,61,44,28,48,38,44,35,40,64,52,42,47,39,53,27,36,35, and 20. ​ ​
-{Ages of Volunteers Narrative} Compute the sample variance and sample standard deviation,and express the numbers in the appropriate units.

Accepted Answer

s² = 124.83

Question 15

How is the value of the correlation coefficient r affected in each of the following cases?
a.Each x value and y is multiplied by 4.
b.Each x value is switched with the corresponding y value.
c.Each x value is increased by 2.

Accepted Answer

a. The correlation coefficient

Question 16

The standard deviation is a measure of variability.

Accepted Answer

A) True 
 B)False

Question 17

Consider the following data:   
a.Calculate the covariance and the coefficient of correlation for the sample.
b.What do these statistics tell you about the relationship between x and y?

Accepted Answer

​ a. @#IMG-DLM& @#IMG-DLM& 
b. The covariance tell

Question 18

Which of the following summary measures cannot be easily approximated from a box plot?

Accepted Answer

A) The range 
B) The interquartile range 
C) The second quartile 
D) The standard deviation 
A) The range 
B) The interquartile range 
C) The second quartile 
D) The standard deviation

Question 19

Expressed in percentiles,the fifth decile is the 50th percentile or the median.

Accepted Answer

A) True 
 B)False

Question 20

A box plot is a graphical representation of the 5-number summary.

Accepted Answer

A) True 
 B)False

Exam 4: Numerical Descriptive Techniques

When two variables x and y are linearly related,it does not necessarily mean that x ____________________ y.

Statisticians typically apply graphical techniques as a first step in a data analysis because we first need to know the shape of the distribution.

Which of the following summary measures is affected most by extreme values?

The coefficient of correlation r is a number that indicates the direction and the strength of the linear relationship between the dependent variable y and the independent variable x.

Assuming a linear relationship between X and Y,if the coefficient of correlation (r)equals −0.75,this means that:

The annual percentage rates of return over the past 10 years for two mutual funds are as shown below.Which fund would you classify as having the higher level of risk?

____________________ techniques give you the big picture of a distribution and ____________________ techniques give you more precise details.

Which of the following statements is true?

What statistics and graphs can you use to answer the following question: Are the observations close to one another,or are they widely dispersed?

The ____________________ is the least effective of all the measures of variability.

Q2 is another name for the ____________________.

In a histogram,the proportion of the total area which must be to the right of the mean is exactly 0.50 if the distribution is symmetric and unimodal.

How is the value of the correlation coefficient r affected in each of the following cases? a.Each x value and y is multiplied by 4. b.Each x value is switched with the corresponding y value. c.Each x value is increased by 2.

The standard deviation is a measure of variability.

Consider the following data: a.Calculate the covariance and the coefficient of correlation for the sample. b.What do these statistics tell you about the relationship between x and y?

Which of the following summary measures cannot be easily approximated from a box plot?

Expressed in percentiles,the fifth decile is the 50th percentile or the median.

A box plot is a graphical representation of the 5-number summary.

What Is Statistics

Graphical Descriptive Techniques 1

Graphical Descriptive Techniques 2

Data Collection and Sampling

Probability

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

Simple Linear Regression and Correlation

Multiple Regression

Model Building

Nonparametric Statistics

Time-Series Analytics and Forecasting

Statistical Process Control

Decision Analysis

Conclusion

Filters

techniques give you the big picture of a distribution and techniques give you more precise details.

Q₂ is another name for the ____________________.