Question 1 of 20 1.0 Points A sample of 20 observations has a standard deviation of 4. The sum of the squared deviations from the sample mean is: A.  320 B.  304 C.  288 D.  400 Reset Selection Question 2 of 20 1.0 Points Suppose that a histogram of a data set is approximately symmetric and "bell shaped". Approximately, what percent of the observations are within three standard deviations of the mean? A.  50% B.  99.7% C.  95% D.  68% Reset Selection Question 3 of 20 1.0 Points Which of the following correctly describes the relationship between a sample and a population?  A.  A sample is a group of populations that are subject to observation.  B.  A population and a sample are not related.  C.  A population is a group of samples that may or may not be included in a study D.  A sample is a group of subjects selected from a population to be studied.  Reset Selection Question 4 of 20 1.0 Points A histogram that has a single peak and looks approximately the same to the left and right of the peak is called: A.  bimodal B.  symmetric C.  proportional D.  balanced Reset Selection Question 5 of 20 1.0 Points Which of the following statements is true for the following data values: 7, 5, 6, 4, 7, 8, and 12? A.  Only the mean and median are equal B.  The mean, median and mode are all equal C.  Only the median and mode are equal D.  Only the mean and mode are equal Reset Selection Question 6 of 20 1.0 Points If a variable has possible values –2, 6, and 17, then this variable is  A.  both a continuous and a discrete variable B.  a discrete variable C.  neither a continuous nor a discrete variable D.  a continuous variable Reset Selection Question 7 of 20 1.0 Points Which of the following statements is true regarding the data set 10, 10, 10, 10, and 10? A.  The range is zero B.  The standard deviation equals zero C.  The interquartile range equals zero D.  all of the above Reset Selection Question 8 of 20 1.0 Points Gender and State are examples of which type of data? A.  Discrete data B.  Continuous data C.  Categorical data D.  Ordinal data Reset Selection Question 9 of 20 1.0 Points If a value represents the 95th percentile, this means that A.  95% of the time you will observe this value B.  95% of all values are below this value C.  95% of all values are above this value  D.  there is a 5% chance that this value is incorrect Reset Selection Question 10 of 20 1.0 Points A scatter plot would be useful for A.  Showing the trend of sales, over time, of five different brands of blank DVDs  B.  Showing the relationship between the sales of blank CDs and blank DVDs  C.  Showing the top selling brands of blank DVDs D.  Showing the relative number of sales of four different brands of blank DVDs Reset Selection Question 11 of 20 1.0 Points Which of the following indicates how many observations fall into various categories? A.  The frequency table B.  The tabulation scale C.  The Likert scale D.  The sample table Reset .

1. Question 1 of 20
1.0 Points
A sample of 20 observations has a standard deviation of 4. The
sum of the squared deviations from the sample mean is:
A.
320
B.
304
C.
288
D.
400
Reset Selection
Question 2 of 20
1.0 Points
Suppose that a histogram of a data set is approximately
symmetric and "bell shaped". Approximately, what percent of
the observations are within three standard deviations of the
mean?
A.
50%
B.
99.7%
C.
95%
D.

2. 68%
Reset Selection
Question 3 of 20
1.0 Points
Which of the following correctly describes the relationship
between a sample and a population?
A.
A sample is a group of populations that are subject to
observation.
B.
A population and a sample are not related.
C.
A population is a group of samples that may or may not be
included in a study
D.
A sample is a group of subjects selected from a population to be
studied.
Reset Selection
Question 4 of 20
1.0 Points
A histogram that has a single peak and looks approximately the
same to the left and right of the peak is called:
A.
bimodal
B.
symmetric
C.
proportional

3. D.
balanced
Reset Selection
Question 5 of 20
1.0 Points
Which of the following statements is true for the following data
values: 7, 5, 6, 4, 7, 8, and 12?
A.
Only the mean and median are equal
B.
The mean, median and mode are all equal
C.
Only the median and mode are equal
D.
Only the mean and mode are equal
Reset Selection
Question 6 of 20
1.0 Points
If a variable has possible values –2, 6, and 17, then this variable
is
A.
both a continuous and a discrete variable
B.
a discrete variable
C.
neither a continuous nor a discrete variable
D.
a continuous variable

4. Reset Selection
Question 7 of 20
1.0 Points
Which of the following statements is true regarding the data set
10, 10, 10, 10, and 10?
A.
The range is zero
B.
The standard deviation equals zero
C.
The interquartile range equals zero
D.
all of the above
Reset Selection
Question 8 of 20
1.0 Points
Gender and State are examples of which type of data?
A.
Discrete data
B.
Continuous data
C.
Categorical data
D.
Ordinal data
Reset Selection
Question 9 of 20
1.0 Points

5. If a value represents the 95th percentile, this means that
A.
95% of the time you will observe this value
B.
95% of all values are below this value
C.
95% of all values are above this value
D.
there is a 5% chance that this value is incorrect
Reset Selection
Question 10 of 20
1.0 Points
A scatter plot would be useful for
A.
Showing the trend of sales, over time, of five different brands
of blank DVDs
B.
Showing the relationship between the sales of blank CDs and
blank DVDs
C.
Showing the top selling brands of blank DVDs
D.
Showing the relative number of sales of four different brands of
blank DVDs
Reset Selection
Question 11 of 20
1.0 Points
Which of the following indicates how many observations fall

6. into various categories?
A.
The frequency table
B.
The tabulation scale
C.
The Likert scale
D.
The sample table
Reset Selection
Question 12 of 20
1.0 Points
Which of the following are the three most common measures of
central location?
A.
Mean, median, and standard deviation
B.
Mean, median, and mode
C.
Mean, variance, and standard deviation
D.
Mean, median, and variance
Reset Selection
Part 2 of 3 -
Question 13 of 20
1.0 Points
Click to see additional instructions

7. A sample of 150 students at a State University was taken after
the final business statistics exam to ask them whether they went
partying the weekend before the final or spent the weekend
studying, and whether they did well or poorly on the final. The
following table contains the result.
Did Well in Exam
Did Poorly in Exam
Studying for Exam
60
15
Went Partying
22
53
Question 14 of 20
1.0 Points
Click to see additional instructions
The following data are the base salaries,
in thousands of dollars
, of 50 chief executive officers for a sample of companies doing
business with the state of Connecticut. That is, the first entry in
the table below corresponds to a salary of $125,000. A copy of
this data set can be found in the Excel Workbook called
CEOSalaries.xls.
125
157
113
127
201
165
145
119
148

8. 158
148
168
117
105
136
136
125
148
108
178
179
191
225
204
104
205
197
119
209
157
209
205
221
178
247
235
217
222
224
187
265
148
165
228
239

9. 245
152
148
115
150
Find the median of the CEO salaries, in thousands of
dollars, rounded to 2 decimal places. Do not use a dollar sign.
Note: $177,760 should be recorded as 177.76.
Question 15 of 20
1.0 Points
Click to see additional instructions
Question 16 of 20
1.0 Points
Click to see additional instructions
The following data are the base salaries,
in thousands of dollars
, of 50 chief executive officers for a sample of companies doing
business with the state of Connecticut. That is, the first entry in
the table below corresponds to a salary of $125,000. A copy of
this data set can be found in the Excel Workbook called
CEOSalaries.xls.
125
157
113
127
201
165
145
119
148
158
148
168
117

10. 105
136
136
125
148
108
178
179
191
225
204
104
205
197
119
209
157
209
205
221
178
247
235
217
222
224
187
265
148
165
228
239
245
152
148
115

11. 150
Find the interquartile range of the CEO salaries, in
thousands of dollars, rounded to 2 decimal places. Do not use a
dollar sign. Note: $177,760 should be recorded as 177.76.
Question 17 of 20
1.0 Points
Click to see additional instructions
A sample of 150 students at a State University was taken after
the final business statistics exam to ask them whether they went
partying the weekend before the final or spent the weekend
studying, and whether they did well or poorly on the final. The
following table contains the result.
Did Well in Exam
Did Poorly in Exam
Studying for Exam
60
15
Went Partying
22
53
Question 18 of 20
1.0 Points
Click to see additional instructions
A sample of 150 students at a State University was taken after
the final business statistics exam to ask them whether they went
partying the weekend before the final or spent the weekend
studying, and whether they did well or poorly on the final. The
following table contains the result.
Did Well on Exam
Did Poorly on Exam
Studying for Exam

12. 60
15
Went Partying
22
53
If the sample is a good representation of the population, what
percentage of those who did poorly on the final exam should we
expect to have spent the weekend studying?
Place your answer in the blank, rounded to 2 decimal places. Do
not use a percentage sign (%). For example, 44.44 would be a
legitmate answer.
Part 3 of 3 -
Question 19 of 20
1.0 Points
A histogram is skewed to the left (or negatively skewed) if it
has a single peak and the values of the distribution extend much
further to the right of the peak than to the left of the peak.
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Question 20 of 20
1.0 Points
If you are in a class where most students do reasonably well on
a test but a few pull down the class average, the histogram
describing the test scores will indicate a positively-skewed
distribution.
Reset Selection