Question 1

If the standard deviations of x and y are 12.5 and 10.8,respectively,and the covariance is 118.8,then the coefficient of correlation r is 0.88.

Accepted Answer

A) True 
 B)False

Question 2

The value of the mean times the number of observations equals the sum of the observations.

Accepted Answer

A) True 
 B)False

Question 3

If the first and second quartiles are closer to each other than are the second and third quartiles,then the shape of the histogram based on the quartiles is ____________________.

Accepted Answer

The answer of If the first and second quartiles are...

Question 4

Suppose that a firm's sales were $3,750,000 five years ago and are $5,250,000 today.What was the geometric mean growth rate in sales over the past five years?

Accepted Answer

If R_g is the geometri

Question 5

A basketball player has the following points for seven games: 20,25,32,18,19,22,and 30.Compute the following measures of central location:
a.mean
b.median
c.mode

Accepted Answer

a. @#IMG-DLM& = 23.714 
b. med

Question 6

In symmetric data,the value for Q2 is always halfway between Q1 and Q3.

Accepted Answer

A) True 
 B)False

Question 7

The units for the standard deviation are the same as the units for the original data (for example,feet,inches,etc.).

Accepted Answer

A) True 
 B)False

Question 8

Weights of Police Officers 
​ The following data represent the weights in pounds of a sample of 25 police officers: 164,148,137, 157,173,156,177,172,169,165,145,168,163,162,174,152,156,168,154,151,174,146,134, 140,and 171. ​ ​
-{Weights of Police Officers Narrative} Construct a relative frequency histogram for the data,using
five class intervals and the value 130 as the lower limit of the first class.

Accepted Answer

The answer of  Weights of Police Officers 
​ The...

Question 9

The standard deviation is the positive square root of the variance.

Accepted Answer

A) True 
 B)False

Question 10

The shape of a distribution helps answer which question about the data?

Accepted Answer

A) Where is the approximate center of the distribution? 
B) Are the observations close to one another,or are they widely dispersed? 
C) Is the distribution symmetric? 
D) All of these choices are true. 
A) Where is the approximate center of the distribution? 
B) Are the observations close to one another,or are they widely dispersed? 
C) Is the distribution symmetric? 
D) All of these choices are true.

Question 11

The median of a set of data is more representative than the mean when the mean is larger than most of the observations.

Accepted Answer

A) True 
 B)False

Question 12

Which of the following statements about the mean is not always correct?

Accepted Answer

A) The sum of the deviations from the mean is zero. 
B) Half of the observations are on either side of the mean. 
C) The mean is a measure of the central location. 
D) The value of the mean times the number of observations equals the sum of all observations. 
A) The sum of the deviations from the mean is zero. 
B) Half of the observations are on either side of the mean. 
C) The mean is a measure of the central location. 
D) The value of the mean times the number of observations equals the sum of all observations.

Question 13

The following data represent the number of children in a sample of 10 families from a certain community: 4,2,1,1,5,3,0,1,0,and 2.
a.Compute the range.
b.Compute the variance.
c.Compute the standard deviation.
d.Compute the coefficient of variation.
e.Explain why in this case range > variance > standard deviation > coefficient of variation.

Accepted Answer

a. 5 
b. 2.77 
c. 1.66 
d. 0.87 
e. The

Question 14

The difference between the largest and smallest observations in an ordered data set is called the range.

Accepted Answer

A) True 
 B)False

Question 15

A mutual fund you purchased in the years 2011-2014 has the following rates of return shown below:   Compute the geometric mean.

Accepted Answer

The answer of A mutual fund you purchased in the...

Question 16

In a negatively skewed distribution,the mean is smaller than the median and the median is smaller than the mode.

Accepted Answer

A) True 
 B)False

Question 17

The mean is a measure of variability.

Accepted Answer

A) True 
 B)False

Question 18

The ____________________ is not as sensitive to extreme values as the ____________________.

Accepted Answer

median; me

Question 19

If the first and second quartiles are farther apart than the second and third quartiles,then the shape of the histogram based on the quartiles is ____________________.

Accepted Answer

The answer of If the first and second quartiles are...

Question 20

If the distribution of a data set were perfectly symmetric,the distance from Q1 to the median would always equal the distance from Q3 to the median in a box plot.

Accepted Answer

A) True 
 B)False

Exam 4: Numerical Descriptive Techniques

If the standard deviations of x and y are 12.5 and 10.8,respectively,and the covariance is 118.8,then the coefficient of correlation r is 0.88.

The value of the mean times the number of observations equals the sum of the observations.

If the first and second quartiles are closer to each other than are the second and third quartiles,then the shape of the histogram based on the quartiles is ____________________.

Suppose that a firm's sales were $3,750,000 five years ago and are $5,250,000 today.What was the geometric mean growth rate in sales over the past five years?

A basketball player has the following points for seven games: 20,25,32,18,19,22,and 30.Compute the following measures of central location: a.mean b.median c.mode

In symmetric data,the value for Q2 is always halfway between Q1 and Q3.

The units for the standard deviation are the same as the units for the original data (for example,feet,inches,etc.).

The standard deviation is the positive square root of the variance.

The shape of a distribution helps answer which question about the data?

The median of a set of data is more representative than the mean when the mean is larger than most of the observations.

Which of the following statements about the mean is not always correct?

The difference between the largest and smallest observations in an ordered data set is called the range.

A mutual fund you purchased in the years 2011-2014 has the following rates of return shown below: Compute the geometric mean.

In a negatively skewed distribution,the mean is smaller than the median and the median is smaller than the mode.

The mean is a measure of variability.

The ____________________ is not as sensitive to extreme values as the ____________________.

If the first and second quartiles are farther apart than the second and third quartiles,then the shape of the histogram based on the quartiles is ____________________.

If the distribution of a data set were perfectly symmetric,the distance from Q1 to the median would always equal the distance from Q3 to the median in a box plot.

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

In symmetric data,the value for Q₂ is always halfway between Q₁ and Q₃.

The is not as sensitive to extreme values as the .

If the distribution of a data set were perfectly symmetric,the distance from Q₁ to the median would always equal the distance from Q₃ to the median in a box plot.