APU MATH302 QUIZ 1 FALL FEB 2015 100 % CORRECT

Question 1 of 20 1.0/
1.0 Points
The mode is best described as the
A.50th percentile
B.same as the average
C.most frequently occurring value
D.middle observation
Question 2 of 20 1.0/
1.0 Points
What type of graph is the figure below?
A.relative frequency histogram
B.pictograph
C.ogive
D.Pareto chart
Question 3 of 20 1.0/
1.0 Points
A population includes:
A.only people
B.only machines
C.only households
D.all objects of interest in a particular
study
Question 4 of 20 1.0/
1.0 Points
A histogram that is positively skewed is also called
A.symmetric
B.balanced
C.skewed to the right
D.skewed to the left
Question 5 of 20 1.0/
1.0 Points
Which of the following statistics is not a measure of
central location?
A.Mean
B.Interquartile range
C.Mode
D.Median
Question 6 of 20 1.0/
1.0 Points
A scatterplot allows one to see:
A.whether there is any relationship between
two variables
B.what type of relationship there is between
two variables
C.Both (a) and (b) are correct
D.Neither (a) nor (b) is correct
Question 7 of 20 1.0/
1.0 Points
The length of the box in the boxplot portrays the
A.mean
B.range
C.median
D.interquartile range
Question 8 of 20 1.0/
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%
Question 9 of 20 1.0/
1.0 Points
For a boxplot, the box itself represents what percent of the
observations?
A.upper 75%
B.middle 50%
C.100%
D.lower 25%
Question 10 of 20 1.0/
1.0 Points
Researchers may gain insight into the characteristics of a
population by examining a
A.replica
B.mathematical model describing the population
C.sample of the population
D.description of the population
Question 11 of 20 1.0/
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
Question 12 of 20 1.0/
1.0 Points
Find the z-score for each student and indicate which one has
a better relative position. An Art Major earned a grade of 46 on an exam
with = 50 and s = 5; A Theater Major
earned a grade of 70 on an exam with =
75 and s = 7.
A.The art major has a higher relative position
than the theater major.
B.Both students have the same score.
C.The theater major has a higher relative
position than the art major.
D.The higher score cannot be determined.
Part 2 of 3 – 6.0/
6.0 Points
Question 13 of 20 1.0/
1.0 Points
Accepted characters: numbers, decimal point markers (period
or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000),
“E” or “e” (used in scientific notation). NOTE: For
scientific notation, a period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where
“a” and “b” need to have explicitly stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is
valid whereas {9i} is not.
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
Of those in the sample who did well on the final exam, what
percentage of them went partying the weekend before the exam? Place your answer
in the blank, rounded to 2 decimal places. Do not use a percentage sign (%).
For example, 44.44 would be a legitimate answer. 26.83
Question 14 of 20 1.0/
1.0 Points
Accepted characters: numbers, decimal point markers (period
or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000),
“E” or “e” (used in scientific notation). NOTE: For
scientific notation, a period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where
“a” and “b” need to have explicitly stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is
valid whereas {9i} is not.
The histogram below represents scores achieved by 250 job
applicants on a personality profile.
What percentage of the job applicants scored below 60? Place your answer in the blank, rounded to 2
decimal places. Do not use a percentage sign (%). For example, 44.44 would be a
legitimate answer.
90
Question 15 of 20 1.0/
1.0 Points
Accepted characters: numbers, decimal point markers (period
or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000),
“E” or “e” (used in scientific notation). NOTE: For
scientific notation, a period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where
“a” and “b” need to have explicitly stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is
valid whereas {9i} is not.
The histogram below represents scores achieved by 250 job
applicants on a personality profile.
Sixty percent of the job applicants scored below what
value? Place your answer in the blank.
Do not use any stray symbols. For example, 123 would be a legitimate answer.
40
Question 16 of 20 1.0/
1.0 Points
Accepted characters: numbers, decimal point markers (period
or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000),
“E” or “e” (used in scientific notation). NOTE: For
scientific notation, a period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where
“a” and “b” need to have explicitly stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is
valid whereas {9i} is not.
The following data represent the number of children in a
sample of 10 families from Chicago: 4, 2, 1, 1, 5, 3, 0, 1, 0, and 2.
Compute the variance of the data. Place your answer, rounded
to two decimal places, in the blank. For example, 3.45 would be a legitimate
entry. 2.77
Question 17 of 20 1.0/
1.0 Points
Accepted characters: numbers, decimal point markers (period
or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000),
“E” or “e” (used in scientific notation). NOTE: For
scientific notation, a period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where
“a” and “b” need to have explicitly stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is
valid whereas {9i} is not.
The following data represent the number of children in a
sample of 10 families from Chicago: 4, 2, 1, 1, 5, 3, 0, 1, 0, and 2.
Compute the mean number of children. Place your answer,
rounded to two decimal places, in the blank. For example, 3.45 would be a
legitimate entry. 1.90
Question 18 of 20 1.0/
1.0 Points
Accepted characters: numbers, decimal point markers (period
or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000),
“E” or “e” (used in scientific notation). NOTE: For
scientific notation, a period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where
“a” and “b” need to have explicitly stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is
valid whereas {9i} is not.
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
148 168 117 105 136
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
245 152 148 115 150
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.
165
CEOSalaries.xls
Part 3 of 3 – 2.0/
2.0 Points
Question 19 of 20 1.0/
1.0 Points
The value of the standard deviation always exceeds that of
the variance.
True
False
Question 20 of 20 1.0/
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.
True
False