Question 1

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 median is

Accepted Answer

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

Question 2

Since the size of the population is always larger than the size of the sample, the population mean must

Accepted Answer

A)  always be smaller than the sample mean 
B)  be larger than the sample mean 
C)  be equal to the sample mean 
D)  None of these alternatives is correct. 
A)  always be smaller than the sample mean 
B)  be larger than the sample mean 
C)  be equal to the sample mean 
D)  None of these alternatives is correct.

Question 3

The sum of deviations of the individual data elements from their mean is

Accepted Answer

A)  always greater than zero 
B)  always less than zero 
C)  sometimes greater than and sometimes less than zero, depending on the data elements 
D)  always equal to zero 
A)  always greater than zero 
B)  always less than zero 
C)  sometimes greater than and sometimes less than zero, depending on the data elements 
D)  always equal to zero

Question 4

Compute the weighted mean for the following data.
 $\begin{array} { l  }\mathbf{x}_{\mathbf{i}}&\text { W eight } w_{i})\
19&12\17&30\14&28\13&10\18&10
\end{array}$

Accepted Answer

The answer of Compute the weighted mean for the following...

Question 5

Which of the following is not a measure of dispersion?

Accepted Answer

A)  mode 
B)  standard deviation 
C)  range 
D)  interquartile range 
A)  mode 
B)  standard deviation 
C)  range 
D)  interquartile range

Question 6

The median is a measure of

Accepted Answer

A)  relative dispersion 
B)  absolute dispersion 
C)  central location 
D)  relative location 
A)  relative dispersion 
B)  absolute dispersion 
C)  central location 
D)  relative location

Question 7

The first quartile

Accepted Answer

A)  contains at least one third of the data elements 
B)  is the same as the 25th percentile 
C)  is the same as the 50th percentile 
D)  is the same as the 75th percentile 
A)  contains at least one third of the data elements 
B)  is the same as the 25th percentile 
C)  is the same as the 50th percentile 
D)  is the same as the 75th percentile

Question 8

The following frequency distribution shows the starting salaries in $1,000s) of a sample of business students:
 $\begin{array}{ll}\text { Starting Salary }&\text { Frequency }\
22-26 & 3 \
27-31 & 5 \
32-36 & 8 \
37-41 & 4
\end{array}$ For the above data, compute the mean starting salary: Give your answer in dollars.)

Accepted Answer

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

Question 9

The symbol σ 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 10

If two groups of numbers have the same mean, then

Accepted Answer

A)  their standard deviations must also be equal 
B)  their medians must also be equal 
C)  their modes must also be equal 
D)  None of these alternatives is correct. 
A)  their standard deviations must also be equal 
B)  their medians must also be equal 
C)  their modes must also be equal 
D)  None of these alternatives is correct.

Question 11

Exhibit 3-1
The following data show the number of hours worked by 200 statistics students.
 $\begin{array}{r}\text { Number of Hours }&\text { Frequency }\
0-9 &40\
10-19&50 \
20-29&70 \
30-39&40
\end{array}$
-Refer to Exhibit 3-1. The relative frequency of students working 9 hours or less

Accepted Answer

A)  is .2 
B)  is .45 
C)  is 40 
D)  cannot be determined from the information given 
A)  is .2 
B)  is .45 
C)  is 40 
D)  cannot be determined from the information given

Question 12

The variance of a sample of 81 observations equals 64. The standard deviation of the sample equals

Accepted Answer

A)  9 
B)  4096 
C)  8 
D)  6561 
A)  9 
B)  4096 
C)  8 
D)  6561

Question 13

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 mean is

Accepted Answer

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

Question 14

The following frequency distribution shows the GMAT scores of a sample of MBA students:
 $\begin{array}{lc}\text { GMAT Score }&\text { Frequency }\
300 \mathrm{up} \text { to } 400 & 2 \
400 \mathrm{up} \text { to } 500 & 6 \
500 \mathrm{up} \text { to } 600 & 10 \
600 \mathrm{up} \text { to } 700 & 5 \
700 \mathrm{up} \text { to } 800 & 2
\end{array}$ For the above data, compute the mean GMAT score.

Accepted Answer

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

Question 15

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

Accepted Answer

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

Question 16

The median of a sample containing the values of -4, -2, +2, +4 is

Accepted Answer

A)  zero 
B)  1.000 
C)  2.000 
D)  4.000 
A)  zero 
B)  1.000 
C)  2.000 
D)  4.000

Question 17

If the variance of a data set is correctly computed with the formula using n - 1 in the denominator, which of the following is true?

Accepted Answer

A)  the data set is a sample 
B)  the data set is a population 
C)  the data set could be either a sample or a population 
D)  the data set is from a census 
A)  the data set is a sample 
B)  the data set is a population 
C)  the data set could be either a sample or a population 
D)  the data set is from a census

Question 18

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 median is

Accepted Answer

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

Question 19

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

Accepted Answer

A)  σ2 
B)  σ 
C)  μ 
D)  N 
A)  σ2 
B)  σ 
C)  μ 
D)  N

Question 20

The following frequency distribution shows the time in minutes) that a sample of students uses the computer terminals per day.
 $$\begin{array} { c c } 
\text { Time } & \text { Frequency } \
20-39 & 2 \
40-59 & 4 \
60-79 & 6 \
80-99 & 4 \
100-119 & 2
\end{array}$$ 
a. Compute the mean.
b. Compute the variance.
c. Compute the standard deviation.
d. Compute the coefficient of variation.

Accepted Answer

a. 69.5
b.

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 median is

Since the size of the population is always larger than the size of the sample, the population mean must

The sum of deviations of the individual data elements from their mean is

Compute the weighted mean for the following data. W eight ) 19 12 17 30 14 28 13 10 18 10

Which of the following is not a measure of dispersion?

The median is a measure of

The first quartile

The following frequency distribution shows the starting salaries in $1,000s) of a sample of business students: Starting Salary Frequency 22-26 3 27-31 5 32-36 8 37-41 4 For the above data, compute the mean starting salary: Give your answer in dollars.)

The symbol σ is used to represent

If two groups of numbers have the same mean, then

Exhibit 3-1 The following data show the number of hours worked by 200 statistics students. Number of Hours Frequency 0-9 40 10-19 50 20-29 70 30-39 40 -Refer to Exhibit 3-1. The relative frequency of students working 9 hours or less

The variance of a sample of 81 observations equals 64. The standard deviation of the sample equals

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 mean is

The following frequency distribution shows the GMAT scores of a sample of MBA students: GMAT Score Frequency 300 to 400 2 400 to 500 6 500 to 600 10 600 to 700 5 700 to 800 2 For the above data, compute the mean GMAT score.

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

The median of a sample containing the values of -4, -2, +2, +4 is

If the variance of a data set is correctly computed with the formula using n - 1 in the denominator, which of the following is true?

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 median is

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

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

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Exam 3: Descriptive Statistics: Numerical Measures

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 median is

Since the size of the population is always larger than the size of the sample, the population mean must

The sum of deviations of the individual data elements from their mean is

Compute the weighted mean for the following data. W eight ) 19 12 17 30 14 28 13 10 18 10

Which of the following is not a measure of dispersion?

The median is a measure of

The first quartile

The following frequency distribution shows the starting salaries in $1,000s) of a sample of business students: Starting Salary Frequency 22-26 3 27-31 5 32-36 8 37-41 4 For the above data, compute the mean starting salary: Give your answer in dollars.)

The symbol σ is used to represent

If two groups of numbers have the same mean, then

Exhibit 3-1 The following data show the number of hours worked by 200 statistics students. Number of Hours Frequency 0-9 40 10-19 50 20-29 70 30-39 40 -Refer to Exhibit 3-1. The relative frequency of students working 9 hours or less

The variance of a sample of 81 observations equals 64. The standard deviation of the sample equals

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 mean is

The following frequency distribution shows the GMAT scores of a sample of MBA students: GMAT Score Frequency 300 to 400 2 400 to 500 6 500 to 600 10 600 to 700 5 700 to 800 2 For the above data, compute the mean GMAT score.

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

The median of a sample containing the values of -4, -2, +2, +4 is

If the variance of a data set is correctly computed with the formula using n - 1 in the denominator, which of the following is true?

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 median is

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

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