Question 1

The pth percentile is a value such that at least p percent of the observations are

Accepted Answer

A) less than or equal to this value 
B) less than this value 
C) more than or equal to this value 
D) more than this value 
A) less than or equal to this value 
B) less than this value 
C) more than or equal to this value 
D) more than this value

Question 2

Descriptive statistics for the closing stock prices of two companies for several trading periods are shown below.
   
a.Which company's stock price has a more dispersed distribution? Explain. Show your complete work and support your answer.
b.Compare the Skewness' of the two and explain what is indicated.

Accepted Answer

a.Coefficient of variation for Baba, Inc

Question 3

The following observations are given for two variables.
   
a.Compute and interpret the sample covariance for the above data.
b.Compute the standard deviation for x.
c.Compute the standard deviation for y.
d.Compute and interpret the sample correlation coefficient.

Accepted Answer

a.19.286 (rounded). Since the covariance

Question 4

The heights (in inches) of 25 individuals were recorded and the following statistics were calculated   The coefficient of variation equals

Accepted Answer

A) 11.2% 
B) 1120% 
C) 0.4% 
D) 40% 
A) 11.2% 
B) 1120% 
C) 0.4% 
D) 40%

Question 5

Exhibit 3-4
The following is the frequency distribution for the speeds of a sample of automobiles traveling on an interstate highway.
  
-Refer to Exhibit 3-4. The mean is

Accepted Answer

A) 35 
B) 670 
C) 10 
D) 67 
A) 35 
B) 670 
C) 10 
D) 67

Question 6

Which of the following symbols represents the mean of the population?

Accepted Answer

A)  $\sigma$2 
B)  $\sigma$ 
C) $\mu$ 
D) $ \overline{\mathrm{x}} $ 
A)  $\sigma$2 
B)  $\sigma$ 
C) $\mu$ 
D) $ \overline{\mathrm{x}} $

Question 7

The closing stock price of Ahmadi, Inc. for a sample of 10 trading days is shown below.
   For the above sample, compute the following measures.
a. The mean
b. The median
c. The mode
d. The variance
e. The standard deviation
f. The range

Accepted Answer

a.86
b.85.

Question 8

A numerical value used as a summary measure for a sample, such as sample mean, is known as a

Accepted Answer

A) population parameter 
B) sample parameter 
C) sample statistic 
D) population mean 
A) population parameter 
B) sample parameter 
C) sample statistic 
D) population mean

Question 9

The Michael Painting Company has purchased paint from several suppliers. The purchase price per gallon and the number of gallons purchased are shown below.
   Compute the weighted average price per gallon.

Accepted Answer

The answer of The Michael Painting Company has purchased paint...

Question 10

Exhibit 3-3
A researcher has collected the following sample data. The mean of the sample is 5.
  
-Refer to Exhibit 3-3. The standard deviation is

Accepted Answer

A) 8.944 
B) 4.062 
C) 13.2 
D) 16.5 
A) 8.944 
B) 4.062 
C) 13.2 
D) 16.5

Question 11

The flashlight batteries produced by one of the northern manufacturers are known to have an average life of 60 hours with a standard deviation of 4 hours. Use Chebyshev's theorem to answer the following questions.
a.At least what percentage of flashlights will have a life of 54 to 66 hours?
b.At least what percentage of the batteries will have a life of 52 to 68 hours?
c.Determine an interval for the batteries lives that will be true for at least 80% of the batteries. (Hint: First compute the Z-score.)

Accepted Answer

a.56%
b.75%
c.60 + (2.236)(4).

Question 12

Exhibit 3-6
The closing stock price of MNM Corporation for the last 7 trading days is shown below.
  
-Refer to Exhibit 3-6. The mode is

Accepted Answer

A) 84 
B) 85 
C) 86 
D) 87 
A) 84 
B) 85 
C) 86 
D) 87

Question 13

The relative frequency of a class is computed by

Accepted Answer

A) dividing the midpoint of the class by the sample size 
B) dividing the frequency of the class by the midpoint 
C) dividing the sample size by the frequency of the class 
D) dividing the frequency of the class by the sample size 
A) dividing the midpoint of the class by the sample size 
B) dividing the frequency of the class by the midpoint 
C) dividing the sample size by the frequency of the class 
D) dividing the frequency of the class by the sample size

Question 14

The following data represent the daily supply (y in thousands of units) and the unit price (x in dollars) for a product.
   
a.Compute and interpret the sample covariance for the above data.
b.Compute the standard deviation for the daily supply.
c.Compute the standard deviation for the unit price.
d.Compute and interpret the sample correlation coefficient.

Accepted Answer

a.11.43 (rounded). The covaria

Question 15

A sample of charge accounts at a local drug store revealed the following frequency distribution of unpaid balances.
   
a.Determine the mean unpaid balance.
b.Determine the variance.
c.Determine the standard deviation.
d.Compute the coefficient of variation.

Accepted Answer

a.74
b.533

Question 16

The following frequency distribution shows the GMAT scores of a sample of MBA students:
   For the above data, compute the mean GMAT score.

Accepted Answer

The answer of The following frequency distribution shows the GMAT...

Question 17

The starting salaries of a sample of college students are given below.
   
a.Compute the mean.
b.Compute the variance.
c.Compute the standard deviation.
d.Compute the coefficient of variation.

Accepted Answer

a.34
b.35.

Question 18

The descriptive measure of dispersion that is based on the concept of a deviation about the mean is

Accepted Answer

A) the range 
B) the interquartile range 
C) the absolute value of the range 
D) the standard deviation 
A) the range 
B) the interquartile range 
C) the absolute value of the range 
D) the standard deviation

Question 19

Exhibit 3-5
You are given the following frequency distribution.
  
-Refer to Exhibit 3-5. The mean is

Accepted Answer

A) 500 
B) 26.315 
C) 30 
D) 25 
A) 500 
B) 26.315 
C) 30 
D) 25

Question 20

The variance of a sample of 169 observations equals 576. The standard deviation of the sample equals

Accepted Answer

A) 13 
B) 24 
C) 576 
D) 28,461 
A) 13 
B) 24 
C) 576 
D) 28,461

The pth percentile is a value such that at least p percent of the observations are

The following observations are given for two variables. a.Compute and interpret the sample covariance for the above data. b.Compute the standard deviation for x. c.Compute the standard deviation for y. d.Compute and interpret the sample correlation coefficient.

The heights (in inches) of 25 individuals were recorded and the following statistics were calculated The coefficient of variation equals

Exhibit 3-4 The following is the frequency distribution for the speeds of a sample of automobiles traveling on an interstate highway. -Refer to Exhibit 3-4. The mean is

Which of the following symbols represents the mean of the population?

The closing stock price of Ahmadi, Inc. for a sample of 10 trading days is shown below. For the above sample, compute the following measures. a. The mean b. The median c. The mode d. The variance e. The standard deviation f. The range

A numerical value used as a summary measure for a sample, such as sample mean, is known as a

The Michael Painting Company has purchased paint from several suppliers. The purchase price per gallon and the number of gallons purchased are shown below. Compute the weighted average price per gallon.

Exhibit 3-3 A researcher has collected the following sample data. The mean of the sample is 5. -Refer to Exhibit 3-3. The standard deviation is

Exhibit 3-6 The closing stock price of MNM Corporation for the last 7 trading days is shown below. -Refer to Exhibit 3-6. The mode is

The relative frequency of a class is computed by

A sample of charge accounts at a local drug store revealed the following frequency distribution of unpaid balances. a.Determine the mean unpaid balance. b.Determine the variance. c.Determine the standard deviation. d.Compute the coefficient of variation.

The following frequency distribution shows the GMAT scores of a sample of MBA students: For the above data, compute the mean GMAT score.

The starting salaries of a sample of college students are given below. a.Compute the mean. b.Compute the variance. c.Compute the standard deviation. d.Compute the coefficient of variation.

The descriptive measure of dispersion that is based on the concept of a deviation about the mean is

Exhibit 3-5 You are given the following frequency distribution. -Refer to Exhibit 3-5. The mean is

The variance of a sample of 169 observations equals 576. The standard deviation of the sample equals

Data and Statistics

Descriptive Statistics: Tabular and Graphical Presentations

Introduction to Probability

Discrete Probability Distributions

Continuous Probability Distributions

Sampling and Sampling Distributions

Interval Estimation

Hypothesis Tests

Comparisons Involving Means, Experimental Design and Analysis of Variance

Comparisons Involving Proportions and a Test of Independence

Simple Linear Regression

Multiple Regression

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Exam 3: Descriptive Statistics: Numerical Measures

The pth percentile is a value such that at least p percent of the observations are

The following observations are given for two variables. a.Compute and interpret the sample covariance for the above data. b.Compute the standard deviation for x. c.Compute the standard deviation for y. d.Compute and interpret the sample correlation coefficient.

The heights (in inches) of 25 individuals were recorded and the following statistics were calculated The coefficient of variation equals

Exhibit 3-4 The following is the frequency distribution for the speeds of a sample of automobiles traveling on an interstate highway. -Refer to Exhibit 3-4. The mean is

Which of the following symbols represents the mean of the population?

The closing stock price of Ahmadi, Inc. for a sample of 10 trading days is shown below. For the above sample, compute the following measures. a. The mean b. The median c. The mode d. The variance e. The standard deviation f. The range

A numerical value used as a summary measure for a sample, such as sample mean, is known as a

The Michael Painting Company has purchased paint from several suppliers. The purchase price per gallon and the number of gallons purchased are shown below. Compute the weighted average price per gallon.

Exhibit 3-3 A researcher has collected the following sample data. The mean of the sample is 5. -Refer to Exhibit 3-3. The standard deviation is

Exhibit 3-6 The closing stock price of MNM Corporation for the last 7 trading days is shown below. -Refer to Exhibit 3-6. The mode is

The relative frequency of a class is computed by

A sample of charge accounts at a local drug store revealed the following frequency distribution of unpaid balances. a.Determine the mean unpaid balance. b.Determine the variance. c.Determine the standard deviation. d.Compute the coefficient of variation.

The following frequency distribution shows the GMAT scores of a sample of MBA students: For the above data, compute the mean GMAT score.

The starting salaries of a sample of college students are given below. a.Compute the mean. b.Compute the variance. c.Compute the standard deviation. d.Compute the coefficient of variation.

The descriptive measure of dispersion that is based on the concept of a deviation about the mean is

Exhibit 3-5 You are given the following frequency distribution. -Refer to Exhibit 3-5. The mean is

The variance of a sample of 169 observations equals 576. The standard deviation of the sample equals

Data and Statistics

Descriptive Statistics: Tabular and Graphical Presentations

Introduction to Probability

Discrete Probability Distributions

Continuous Probability Distributions

Sampling and Sampling Distributions

Interval Estimation

Hypothesis Tests

Comparisons Involving Means, Experimental Design and Analysis of Variance

Comparisons Involving Proportions and a Test of Independence

Simple Linear Regression

Multiple Regression

Filters