Question 1

Which of the following symbols represents the standard deviation of the population?

Accepted Answer

A)  ?2 
B)  ? 
C)  ? 
D) $\bar { x }$ 
A)  ?2 
B)  ? 
C)  ? 
D) $\bar { x }$

Question 2

The measure of dispersion which is not measured in the same units as the original data is the

Accepted Answer

A)  median 
B)  standard deviation 
C)  coefficient of determination 
D)  variance 
A)  median 
B)  standard deviation 
C)  coefficient of determination 
D)  variance

Question 3

The average wage of Tennessee cashiers is $14 per hour with a standard deviation of $4.20. In Georgia, the average wage of cashiers is $16 with a standard deviation of $4.40. In which state do the wages of cashiers appear to be more dispersed?

Accepted Answer

The coefficient of variation i

Question 4

Exhibit 3-5
You are given the following frequency distribution.
 $\begin{array}{cc}\text { Class }&\text { Frequency }\
10-14 & 1 \
15-19 & 2 \
20-24 & 5 \
25-29 & 8 \
30-34 & 4
\end{array}$
-Refer to Exhibit 3-5. The coefficient of variation is

Accepted Answer

A)  25% 
B)  21.91% 
C)  5.477% 
D)  30% 
A)  25% 
B)  21.91% 
C)  5.477% 
D)  30%

Question 5

The variance of a sample was reported to be 81. The report indicated that = 972. What has been the sample size?

Accepted Answer

The answer of The variance of a sample was reported...

Question 6

Exhibit 3-5
You are given the following frequency distribution.
 $\begin{array}{cc}\text { Class }&\text { Frequency }\
10-14 & 1 \
15-19 & 2 \
20-24 & 5 \
25-29 & 8 \
30-34 & 4
\end{array}$
-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 7

The standard deviation of a sample of 100 observations equals 64. The variance of the sample equals

Accepted Answer

A)  8 
B)  10 
C)  6400 
D)  4,096 
A)  8 
B)  10 
C)  6400 
D)  4,096

Question 8

Descriptive statistics for the closing stock prices of two companies for several trading periods are shown below.
 $\begin{array} { l  }
\text { Baba, Inc. }&\text { Maman, Inc. } \
\begin{array}{lr}
\hline \text { Mean } & 4.04 \
\text { Standard Error } & 0.11 \
\text { Median } & 4.07 \
\text { Mode } & 3.59 \
\text { Standard Deviation } & 1.13 \
\text { Sample Variance } & 1.28 \
\text { Kurtosis } & -1.10 \
\text { Skewness } & 0.04 \
\text { Range } & 3.98 \
\text { Minimum } & 2.00 \
\text { Maximum } & 5.98 \
\text { Sum } & 416.05 \
\text { Count } & 103\\hline 
\end{array}&\begin{array}{lr}\hline 
\text { Mean } & 16.41 \
\text { Standard Error } & 0.22 \
\text { Median } & 16.83 \
\text { Mode } & 16.59 \
\text { Standard Deviation } & 2.34 \
\text { Sample Variance } & 5.48 \
\text { Kurtosis } & 9.10 \
\text { Skewness } & -2.85 \
\text { Range } & 12.57 \
\text { Minimum } & 6.29 \
\text { Maximum } & 18.86 \
\text { Sum } & 1919.63 \
\text { Count } & 117\
\hline \end{array}\
\end{array}$
 
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, In

Question 9

Exhibit 3-6
The closing stock price of MNM Corporation for the last 7 trading days is shown below.
 $\begin{array}{ll}\text { Day }&\text { Stock Price }\
1 & 84 \
2 & 87 \
3 & 84 \
4 & 88 \
5 & 85 \
6 & 90 \
7 & 91
\end{array}$
-Refer to Exhibit 3-6. The range is

Accepted Answer

A)  7 
B)  8 
C)  9 
D)  91 
A)  7 
B)  8 
C)  9 
D)  91

Question 10

Positive values of covariance indicate

Accepted Answer

A)  a positive variance of the x values 
B)  a positive variance of the y values 
C)  the standard deviation is positive 
D)  positive relation between the independent and the dependent variables 
A)  a positive variance of the x values 
B)  a positive variance of the y values 
C)  the standard deviation is positive 
D)  positive relation between the independent and the dependent variables

Question 11

A group of students had dinner at a local restaurant. The total bill for the dinner was $414.70. Each student paid his/her equal share of the bill, which was $18.85. How many students were at the dinner?

Accepted Answer

A)  4 
B)  415 
C)  19 
D)  22 
A)  4 
B)  415 
C)  19 
D)  22

Question 12

The weights in pounds) of a sample of 36 individuals were recorded and the following statistics were calculated. mean = 160 range = 60
Mode = 165 variance = 324
Median = 170
The coefficient of variation equals

Accepted Answer

A)  0.1125% 
B)  11.25% 
C)  203.12% 
D)  0.20312% 
A)  0.1125% 
B)  11.25% 
C)  203.12% 
D)  0.20312%

Question 13

Exhibit 3-6
The closing stock price of MNM Corporation for the last 7 trading days is shown below.
 $\begin{array}{ll}\text { Day }&\text { Stock Price }\
1 & 84 \
2 & 87 \
3 & 84 \
4 & 88 \
5 & 85 \
6 & 90 \
7 & 91
\end{array}$
-The variance of a sample containing the values of -2, 1, and 1 is

Accepted Answer

A)  zero 
B)  1.732 
C)  2.000 
D)  3.000 
A)  zero 
B)  1.732 
C)  2.000 
D)  3.000

Question 14

The symbol σ2 is used to represent

Accepted Answer

A)  the variance of the population 
B)  the standard deviation of the sample 
C)  the standard deviation of the population 
D)  the variance of the sample 
A)  the variance of the population 
B)  the standard deviation of the sample 
C)  the standard deviation of the population 
D)  the variance of the sample

Question 15

When should measures of location and dispersion be computed from grouped data rather than from individual data values?

Accepted Answer

A)  as much as possible since computations are easier 
B)  only when individual data values are unavailable 
C)  whenever computer packages for descriptive statistics are unavailable 
D)  only when the data are from a population 
A)  as much as possible since computations are easier 
B)  only when individual data values are unavailable 
C)  whenever computer packages for descriptive statistics are unavailable 
D)  only when the data are from a population

Question 16

The mean of a sample having the values of -2, 1, and 1 is

Accepted Answer

A)  zero 
B)  1 
C)  2 
D)  3 
A)  zero 
B)  1 
C)  2 
D)  3

Question 17

The numerical value of the standard deviation can never be

Accepted Answer

A)  larger than the variance 
B)  zero 
C)  negative 
D)  smaller than the variance 
A)  larger than the variance 
B)  zero 
C)  negative 
D)  smaller than the variance

Question 18

When data are positively skewed, the mean will usually be

Accepted Answer

A)  greater than the median 
B)  smaller than the median 
C)  equal to the median 
D)  positive 
A)  greater than the median 
B)  smaller than the median 
C)  equal to the median 
D)  positive

Question 19

Exhibit 3-2
A researcher has collected the following sample data
 $\begin{array} { c c c c } 
5 & 12 & 6 & 8 &5\
6 & 7 & 5 & 12&4
\end{array}$
-Refer to Exhibit 3-2. The mode is

Accepted Answer

A)  5 
B)  6 
C)  7 
D)  8 
A)  5 
B)  6 
C)  7 
D)  8

Question 20

In computing descriptive statistics from grouped data,

Accepted Answer

A)  data values are treated as if they occur at the midpoint of a class 
B)  the grouped data result is more accurate than the ungrouped result 
C)  the grouped data computations are used only when a population is being analyzed 
D)  None of these alternatives is correct. 
A)  data values are treated as if they occur at the midpoint of a class 
B)  the grouped data result is more accurate than the ungrouped result 
C)  the grouped data computations are used only when a population is being analyzed 
D)  None of these alternatives is correct.

Which of the following symbols represents the standard deviation of the population?

The measure of dispersion which is not measured in the same units as the original data is the

The average wage of Tennessee cashiers is $14 per hour with a standard deviation of $4.20. In Georgia, the average wage of cashiers is $16 with a standard deviation of $4.40. In which state do the wages of cashiers appear to be more dispersed?

Exhibit 3-5 You are given the following frequency distribution. Class Frequency 10-14 1 15-19 2 20-24 5 25-29 8 30-34 4 -Refer to Exhibit 3-5. The coefficient of variation is

The variance of a sample was reported to be 81. The report indicated that = 972. What has been the sample size?

Exhibit 3-5 You are given the following frequency distribution. Class Frequency 10-14 1 15-19 2 20-24 5 25-29 8 30-34 4 -Refer to Exhibit 3-5. The mean is

The standard deviation of a sample of 100 observations equals 64. The variance of the sample equals

Exhibit 3-6 The closing stock price of MNM Corporation for the last 7 trading days is shown below. Day Stock Price 1 84 2 87 3 84 4 88 5 85 6 90 7 91 -Refer to Exhibit 3-6. The range is

Positive values of covariance indicate

A group of students had dinner at a local restaurant. The total bill for the dinner was $414.70. Each student paid his/her equal share of the bill, which was $18.85. How many students were at the dinner?

The weights in pounds) of a sample of 36 individuals were recorded and the following statistics were calculated. mean = 160 range = 60 Mode = 165 variance = 324 Median = 170 The coefficient of variation equals

Exhibit 3-6 The closing stock price of MNM Corporation for the last 7 trading days is shown below. Day Stock Price 1 84 2 87 3 84 4 88 5 85 6 90 7 91 -The variance of a sample containing the values of -2, 1, and 1 is

The symbol σ2 is used to represent

When should measures of location and dispersion be computed from grouped data rather than from individual data values?

The mean of a sample having the values of -2, 1, and 1 is

The numerical value of the standard deviation can never be

When data are positively skewed, the mean will usually be

Exhibit 3-2 A researcher has collected the following sample data 5 12 6 8 5 6 7 5 12 4 -Refer to Exhibit 3-2. The mode is

In computing descriptive statistics from grouped data,

Data and Statistics

Descriptive Statistics: Tabular and Graphical Displays

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

Exam 3: Descriptive Statistics: Numerical Measures

Which of the following symbols represents the standard deviation of the population?

The measure of dispersion which is not measured in the same units as the original data is the

The average wage of Tennessee cashiers is $14 per hour with a standard deviation of $4.20. In Georgia, the average wage of cashiers is $16 with a standard deviation of $4.40. In which state do the wages of cashiers appear to be more dispersed?

Exhibit 3-5 You are given the following frequency distribution. Class Frequency 10-14 1 15-19 2 20-24 5 25-29 8 30-34 4 -Refer to Exhibit 3-5. The coefficient of variation is

The variance of a sample was reported to be 81. The report indicated that = 972. What has been the sample size?

Exhibit 3-5 You are given the following frequency distribution. Class Frequency 10-14 1 15-19 2 20-24 5 25-29 8 30-34 4 -Refer to Exhibit 3-5. The mean is

The standard deviation of a sample of 100 observations equals 64. The variance of the sample equals

Exhibit 3-6 The closing stock price of MNM Corporation for the last 7 trading days is shown below. Day Stock Price 1 84 2 87 3 84 4 88 5 85 6 90 7 91 -Refer to Exhibit 3-6. The range is

Positive values of covariance indicate

A group of students had dinner at a local restaurant. The total bill for the dinner was $414.70. Each student paid his/her equal share of the bill, which was $18.85. How many students were at the dinner?

The weights in pounds) of a sample of 36 individuals were recorded and the following statistics were calculated. mean = 160 range = 60 Mode = 165 variance = 324 Median = 170 The coefficient of variation equals

Exhibit 3-6 The closing stock price of MNM Corporation for the last 7 trading days is shown below. Day Stock Price 1 84 2 87 3 84 4 88 5 85 6 90 7 91 -The variance of a sample containing the values of -2, 1, and 1 is

The symbol σ2 is used to represent

When should measures of location and dispersion be computed from grouped data rather than from individual data values?

The mean of a sample having the values of -2, 1, and 1 is

The numerical value of the standard deviation can never be

When data are positively skewed, the mean will usually be

Exhibit 3-2 A researcher has collected the following sample data 5 12 6 8 5 6 7 5 12 4 -Refer to Exhibit 3-2. The mode is

In computing descriptive statistics from grouped data,

Data and Statistics

Descriptive Statistics: Tabular and Graphical Displays

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