Stat 200 – Quiz #1 Instructor: Dr. T Multiple-Choice: Choose exactly ONE answer
ID: 3299037 • Letter: S
Question
Stat 200 – Quiz #1 Instructor: Dr. T
Multiple-Choice: Choose exactly ONE answer for each question.
There are 20 problems each is worth 2 points. Total 40 points
01. An Internet study asked respondents to indicate their education level on the following scale: Less than High School, High School, Some College, College +. Which of the following statements is (are) true?
A. Education level is a qualitative variable.
B. Education level is nominal scaled.
C. Education level is ordinal scaled.
D. Both A and B
E. Both A and C
Consider the following to answer the next two questions:
Consumer Reports Health routinely compares drugs in terms of effectiveness and safety. In summer 2008 they reviewed drugs used to treat arthritis. Among the information reported was convenience of use (how many pills required each day) and possible side effects (e.g., dizziness, stomach upset).
02. In the Consumer Reports Health study on arthritis drugs, possible side effects is what kind of variable?
A. Quantitative.
B. Qualitativee
C. Nominal.
D. Both A and C.
E. Both B and C.
03. The Consumer Reports Health study on arthritis drugs also took into consideration cost. Cost is
A. is a nominal variable.
B. is a qualitative variable.
C. is a quantitative variable.
D. is a random variable.
E. is an irrelevant variable.
04. To avoid working late, a quality control analyst simply inspects the first 100 items produced in a day. This sampling plan is called
A. random
B. stratified
C. systematic
D. cluster
E. convenience
05. Suppose that a company has an alphabetized list of regular customers who belong to their rewards program. They plan to survey a sample of 120 of those customers. After randomly selecting a customer on the list, every 25th customer from that point on is chosen to be in the sample. This sampling plan is called
A. Simple Random Sampling.
B. Stratified Sampling.
C. Cluster Sampling.
D. Systematic Sampling.
E. Convenience Sampling
06. An exit poll in a large city is conducted by surveying everyone who leaves the polling booth at 10 randomly selected election precincts. What type of sampling is being used?
A. random
B. stratified
C. systematic
D. cluster
E. convenience
07. Temperature measured in degrees Centigrade or Fahrenheit is an example of a variable that uses
A. the ratio scale
B. the interval scale
C. the ordinal scale
D. the nominal scale
E. none of the above
Use the following boxplots to answer the next two questions:
Boxplots of earnings per share (EPS) data for a sample of retail company stocks and a sample of energy company stocks are shown below.
08. Which of the following statements is correct?
A. The median EPS is higher for energy stocks compared to retail stocks.
B. The median EPS is higher for retail stocks compared to energy stocks.
C. The IQR for the EPS data is larger for retail stocks than for energy stocks.
D. The EPS data are more variable for retail stocks than for energy stocks.
E. The mean is higher for energy stocks compared to retail stocks.
09. Which of the following statement is true about the distributions of EPS for retail and energy stocks?
A. The distribution of EPS for retail stocks is skewed to the right.
B. The distribution of EPS for energy stocks is symmetric.
C. Both distributions of EPS are symmetric.
D. The distribution of EPS for retail stocks is skewed to the left.
E. The distribution of EPS for energy stocks is skewed to the left.
10. The measure of central location which is most likely to be influenced by extreme values is
A. the range
B. the median
C. the mean
D. the mode
E. the IQR
11. One of the most widely used measures of dispersion is
A. the mean
B. the range
C. the z-score
D. the standard deviation
E. the IQR
12. What graph should be used to show the relationship between the parts and the whole?
A. a histogram
B. a pie chart
C. a bar chart
D. a box plot
E. a dot plot
Use the data in the table below to answer the next four questions.
The table below shows closing share prices for a small sample of companies.
COMPANY
CLOSING SHARE PRICE – 08/07
3M Dental Products
86.95
Tyco Electronics Power Systems
47.45
Kyocera America Inc.
94.10
Pfizer Inc.
22.39
Xerox Company
17.56
Northrop Grumman Corporation
75.81
Lockheed Martin Maritime Systems
100.17
Sony DADC
51.91
Matsushita Electronic Components
17.91
Foster Wheeler Environmental Corp.
55.67
13. The mean closing share price is
A. $29.82
B. $31.43
C. $56.99
D. $62.19
E. None of the above
14. The median closing share price is
A. 49.68
B. 46.69
C. 75.81
D. 53.79
E. None of the above
15. The standard deviation in closing share prices is
A. $31.43
B. $29.82
C. $56.99
D. $62.19
E. None of the above
16. The z score for the share price for Matsushita Electronic Components is
A. 1.24
B. 2.34
C. -2.34
D. -3.00
E. -1.24
Consider the following to answer the next four questions:
A full service brokerage firm gathered information on how their clients were investing for retirement. Based on age, clients were categorized according to where the largest percentage of their retirement portfolio was invested and shown in the table below.
Age 50 or Younger
Over age 50
Total
Mutual Funds
30
34
64
Stocks
37
45
82
Bonds
19
23
42
Total
86
102
188
17. Of the clients over age 50, the percentage who invest in mutual funds is
A. 53.1%
B. 33.3%
C. 18.1%
D. 34.0%
E. 54.3%
18. Of the clients who invest in mutual funds, the percentage over age 50 is
A. 53.1%
B. 33.3%
C. 18.1%
D. 34.0%
E. 54.3%
19. The percentage of clients over age 50 is
A. 53.1%
B. 33.3%
C. 18.1%
D. 34.0%
E. 54.3%
20. The test scores of a sample of 40 students are summarized in the frequency distribution below. Find the standard deviation s.
Score Students
50 – 59 6
60 – 69 11
70 – 79 12
80 – 89 5
90 – 99 6
A 11.43
B 12.56
C 12.72
D 13.35
E None of the above
COMPANY
CLOSING SHARE PRICE – 08/07
3M Dental Products
86.95
Tyco Electronics Power Systems
47.45
Kyocera America Inc.
94.10
Pfizer Inc.
22.39
Xerox Company
17.56
Northrop Grumman Corporation
75.81
Lockheed Martin Maritime Systems
100.17
Sony DADC
51.91
Matsushita Electronic Components
17.91
Foster Wheeler Environmental Corp.
55.67
Explanation / Answer
Answer - 1; Both A and C are correct (Option D)
Answer - 2: Option E
Answer - 3: Option C
Answer - 4: Option E
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