COMM215 ALL ASSIGMENTS QUIZZES
PRACTICE TEST-GRADED A
Chapter 1 Assignment
1. Data collected for a particular study are referred to as a data .
- Set
2. If we collect data on the number of wins the Dallas Cowboys earned each of the past 10 years, we have
data.
- Time series
3. If we collect data on the number of wins each team in the NFL had during the 2011-12 season, we have
data.
- Cross-sectional
4. Methods for obtaining a sample are called
- Sampling designs
5. A company that produces and markets video game systems wishes to assess its customers' level of
satisfaction with a relatively new model, the XYZ-Box. In the six months since the introduction of the
model, the company has received 73,219 warranty registrations from purchasers. The company will
select a random sample of 65 of these registrations and will conduct telephone interviews with the
purchasers. Specifically, each purchaser will be asked to state his or her level of agreement with each of
the seven statements listed on the survey instrument given in the following table.. Here, the level of
agreement for each statement is measured on a 7-point Likert scale. Purchaser satisfaction will be
measured by adding the purchaser’s responses to the seven statements. It follows that for each consumer
the minimum composite score possible is 7 and the maximum is 49. Furthermore, experience has shown
that a purchaser of a video game system is “very satisfied” if his or her composite score is at least 42.
The Video Game Satisfaction Survey Instrument
Strongl
Strongly
y
Statement Disagree Agree
The game console of the XYZ-Box is well designed. 1 23456 7
The game controller of the XYZ-Box is easy to handle. 1 23456 7
The XYZ-Box has high-quality graphics capabilities. 1 23456 7
The XYZ-Box has high-quality audio capabilities. 1 23456 7
The XYZ-Box serves as a complete entertainment center. 1 23456 7
There is a large selection of XYZ-Box games to choose from. 1 23456 7
I am totally satisfied with my XYZ-Box game system. 1 23456 7
Suppose that when the 65 customers are interviewed, their composite scores are as given in the following table.
Composite Scores for the Video Game Satisfaction Rating Case
40 40 46 49 38
41 41 44 39 38
43 44 39 46 41
41 49 42 39 47
46 47 47 42 39
41 41 47 44
44 45 47 45
44 44 49 46
47 48 49 43
43 42 38 43
46 41 41 45
43 43 45 47
49 38 46 41
38 39 45 49
40 38 46 47
,Using the data, estimate limits between which most of the 73,219 composite scores would fall. Also, estimate
the proportion of the 73,219 composite scores that would be at least 42. (Round your proportion of scores
answer to 2 decimal places.)
38 and 49
Most of the scores would fall between
An estimate of the proportion of scores that would be at least 42 = 64.60 %.
- 38 and 49 are the most extreme scores in the sample
- 42/65=64.60%
6. A ratio variable has the following characteristic.
- Inherently defined zero value
7. consists of a set of concepts and techniques that are used to describe populations and samples
and to make statistical inferences about populations by using samples.
- Traditional statistics
8. refers to describing the important aspects of a set of measurements.
- Descriptive statistics
9. is the difference between a numerical descriptor of the population and the corresponding
descriptor of the sample.
- Sampling error
10. Which of the following is a type of question used in survey research?
- All of the other answers are correct; open-ended, multiple-choice, dischotomous
11. The change in the daily price of a stock is what type of variable?
- Quantitative
12. Which of the following is a categorical variable?
- Whether a person has a traffic violation
13. A data set provides information about some group of individual .
- Elements
14. Which of the following is a quantitative variable?
- Mileage of a car
15. sampling is where we know the chance that each element will be included in the sample,
which allows us to make statistical inferences about the sample population.
- Probability
16. When the data being studied are gathered from a published source, this is referred to as a(n) .
- Existing data source
Chapter 2 assignment
1. Pareto charts are frequently used to identify .
- The most common types of defects
2. An example of manipulating a graphical display to distort reality is .
- Stretching the axes
3. A displays the frequency of each class with qualitative data and a displays the
frequency of each class with quantitative data.
- Bar chart, histogram
4. A CFO is looking at what percentage of a company's resources are spent on computing. He samples
companies in the pharmaceutical industry and develops the following stem-and-leaf display (leaf unit =
0.1).
5 269
6 255568999
, 7 11224557789
8 001222458
9 02455679
10 1556
11 137
12
13 255
What would be the class length used in creating a frequency histogram?
- 1.4
o 50 data measurements so 2K= closest value larger than 50. 26=64. So 6 classes.
o Class length= (max value-min value)/6.
o (13.5-5.2)/6=1.38 rounded 1.4
5. If there are 130 values in a data set, how many classes should be created for a frequency histogram?
- 8
o 2k, where k = number of classes and 2k is the closest value larger than 130. 27 = 128; 28 = 256.
6. As a general rule, when creating a stem-and-leaf display, there should be stem values.
- Between 5 and 20
7. Which of the following divides quantitative measurements into classes and graphs the frequency,
relative frequency, or percentage frequency for each class?
- Histogram
8. A CFO is looking at what percentage of a company's resources are spent on computing. He samples
companies in the pharmaceutical industry and develops the following stem-and-leaf display (leaf unit =
0.1).
5 269
6 255568999
7 11224557789
8 001222458
9 02455679
10 1556
11 137
12
13 255
What is the smallest percentage spent on R&D?
- 5.2
9. A CFO is looking at what percentage of a company's resources are spent on computing. He samples
companies in the pharmaceutical industry and develops the following stem-and-leaf display (leaf unit =
0.1).
5 269
6 255568999
7 11224557789
8 001222458
9 02455679
10 1556
11 137
12
13 255
What would be the first class interval for the frequency histogram?
- 5.2<6.6
PRACTICE TEST-GRADED A
Chapter 1 Assignment
1. Data collected for a particular study are referred to as a data .
- Set
2. If we collect data on the number of wins the Dallas Cowboys earned each of the past 10 years, we have
data.
- Time series
3. If we collect data on the number of wins each team in the NFL had during the 2011-12 season, we have
data.
- Cross-sectional
4. Methods for obtaining a sample are called
- Sampling designs
5. A company that produces and markets video game systems wishes to assess its customers' level of
satisfaction with a relatively new model, the XYZ-Box. In the six months since the introduction of the
model, the company has received 73,219 warranty registrations from purchasers. The company will
select a random sample of 65 of these registrations and will conduct telephone interviews with the
purchasers. Specifically, each purchaser will be asked to state his or her level of agreement with each of
the seven statements listed on the survey instrument given in the following table.. Here, the level of
agreement for each statement is measured on a 7-point Likert scale. Purchaser satisfaction will be
measured by adding the purchaser’s responses to the seven statements. It follows that for each consumer
the minimum composite score possible is 7 and the maximum is 49. Furthermore, experience has shown
that a purchaser of a video game system is “very satisfied” if his or her composite score is at least 42.
The Video Game Satisfaction Survey Instrument
Strongl
Strongly
y
Statement Disagree Agree
The game console of the XYZ-Box is well designed. 1 23456 7
The game controller of the XYZ-Box is easy to handle. 1 23456 7
The XYZ-Box has high-quality graphics capabilities. 1 23456 7
The XYZ-Box has high-quality audio capabilities. 1 23456 7
The XYZ-Box serves as a complete entertainment center. 1 23456 7
There is a large selection of XYZ-Box games to choose from. 1 23456 7
I am totally satisfied with my XYZ-Box game system. 1 23456 7
Suppose that when the 65 customers are interviewed, their composite scores are as given in the following table.
Composite Scores for the Video Game Satisfaction Rating Case
40 40 46 49 38
41 41 44 39 38
43 44 39 46 41
41 49 42 39 47
46 47 47 42 39
41 41 47 44
44 45 47 45
44 44 49 46
47 48 49 43
43 42 38 43
46 41 41 45
43 43 45 47
49 38 46 41
38 39 45 49
40 38 46 47
,Using the data, estimate limits between which most of the 73,219 composite scores would fall. Also, estimate
the proportion of the 73,219 composite scores that would be at least 42. (Round your proportion of scores
answer to 2 decimal places.)
38 and 49
Most of the scores would fall between
An estimate of the proportion of scores that would be at least 42 = 64.60 %.
- 38 and 49 are the most extreme scores in the sample
- 42/65=64.60%
6. A ratio variable has the following characteristic.
- Inherently defined zero value
7. consists of a set of concepts and techniques that are used to describe populations and samples
and to make statistical inferences about populations by using samples.
- Traditional statistics
8. refers to describing the important aspects of a set of measurements.
- Descriptive statistics
9. is the difference between a numerical descriptor of the population and the corresponding
descriptor of the sample.
- Sampling error
10. Which of the following is a type of question used in survey research?
- All of the other answers are correct; open-ended, multiple-choice, dischotomous
11. The change in the daily price of a stock is what type of variable?
- Quantitative
12. Which of the following is a categorical variable?
- Whether a person has a traffic violation
13. A data set provides information about some group of individual .
- Elements
14. Which of the following is a quantitative variable?
- Mileage of a car
15. sampling is where we know the chance that each element will be included in the sample,
which allows us to make statistical inferences about the sample population.
- Probability
16. When the data being studied are gathered from a published source, this is referred to as a(n) .
- Existing data source
Chapter 2 assignment
1. Pareto charts are frequently used to identify .
- The most common types of defects
2. An example of manipulating a graphical display to distort reality is .
- Stretching the axes
3. A displays the frequency of each class with qualitative data and a displays the
frequency of each class with quantitative data.
- Bar chart, histogram
4. A CFO is looking at what percentage of a company's resources are spent on computing. He samples
companies in the pharmaceutical industry and develops the following stem-and-leaf display (leaf unit =
0.1).
5 269
6 255568999
, 7 11224557789
8 001222458
9 02455679
10 1556
11 137
12
13 255
What would be the class length used in creating a frequency histogram?
- 1.4
o 50 data measurements so 2K= closest value larger than 50. 26=64. So 6 classes.
o Class length= (max value-min value)/6.
o (13.5-5.2)/6=1.38 rounded 1.4
5. If there are 130 values in a data set, how many classes should be created for a frequency histogram?
- 8
o 2k, where k = number of classes and 2k is the closest value larger than 130. 27 = 128; 28 = 256.
6. As a general rule, when creating a stem-and-leaf display, there should be stem values.
- Between 5 and 20
7. Which of the following divides quantitative measurements into classes and graphs the frequency,
relative frequency, or percentage frequency for each class?
- Histogram
8. A CFO is looking at what percentage of a company's resources are spent on computing. He samples
companies in the pharmaceutical industry and develops the following stem-and-leaf display (leaf unit =
0.1).
5 269
6 255568999
7 11224557789
8 001222458
9 02455679
10 1556
11 137
12
13 255
What is the smallest percentage spent on R&D?
- 5.2
9. A CFO is looking at what percentage of a company's resources are spent on computing. He samples
companies in the pharmaceutical industry and develops the following stem-and-leaf display (leaf unit =
0.1).
5 269
6 255568999
7 11224557789
8 001222458
9 02455679
10 1556
11 137
12
13 255
What would be the first class interval for the frequency histogram?
- 5.2<6.6
