1 . A time series is a sequence of data points, typically consisting of successive measurements made...
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1. A time series is a sequence of data points, typically consisting of successive measurements made over a time interval. Examples of the time series include all except:
A. a stock's opening price for each month.
B. ocean tides.
C. point differential against opponents for a football team this year.
D. the volume of shares traded today in the stock market.
2. Data mining deals with methods for developing useful decision-making information from large databases. It performs all actions except the:
A. collection of useful data.
B. extraction of predictive information.
C. reselling of the packaged data.
D. warehousing of data.
3. The Department of Homeland Security has noted that on average 1120 suspicious vehicles are stopped and searched each day in the United States. This number is used to estimate the number of cars stopped in an average yearly period. The average number of cars stopped is not an example of:
A. a population.
B. a sample.
C. descriptive statistics.
D. statistical inference.
4. Examples of cross-sectional data include all except:
A. the comparison of five different variables for the 60 World Trade Organization nations on January 1st .
B. the comparison of mpg data gathered in a study on all 2015 cross-over SUVs
C. the comparison of performance of all telecommunications stocks today.
D. the comparison of sales output of all 10 salespeople in the Western Sales Region for the 3 rd quarter.
5. Data obtained from a nominal scale:
A. can be either numeric or nonnumeric.
B. must be alphabetic.
C. must be numeric.
D. must rank and order the data.
6. Some hotels ask their guests to rate the hotel's services as excellent, very good, good, and poor. This is an example of the:
A. interval scale.
B. nominal scale.
C. ordinal scale.
D. ratio scale.
7. An experiment is conducted to study the effects of a new blood pressure medicine on subjects. A random sample of 60 people are placed into three groups of 20 according to their age (young, middle-aged, and senior). Each group of 20 people are randomly assigned to two treatment groups (new medicine and placebo). How many total treatment groups are there?
A. 1.
B. 2.
C. 4.
D. 6
8. The major applications of data mining have been made by companies with a strong _____ focus.
A. consumer
B. electronic design
C. human resource
D. research and development
9. Statistical studies in which researchers do not control variables of interest are:
A. completely randomized studies.
B. experimental studies.
C. observational studies
D. placebo studies.
10. The owner of a factory regularly requests a graphical summary of all employees' salaries. The graphical summary of salaries is an example of:
A. an experiment.
B. a sample.
C. descriptive statistics.
D. statistical inference.
11. Anyone who wants to use the data and statistical analysis as aids to decision making must be aware of the time and cost issues. If important data are not readily available, it would be best to:
A. borrow another company's data.
B. conduct a times series analysis.
C. do nothing at all due to cost.
D. use a cross-sectional data set.
12. The sample size:
A. can be larger or smaller than the population size.
B. can be larger than the population size.
C. is always equal to the population size.
D. is always smaller than the population size.
13. Examples of quantitative data include all of the following except:
A. the number of pairs of shoes in your closet.
B. the temperature outside to the nearest degree.
C. your weight rounded to the nearest gram.
D. your zip code
14. In a sample of 200 students in a university, 40, or 20%, are Communications majors. Based on the above information, the school's paper reported that "an estimated 20% of all the students at the university are Communications majors." This report is an example of:
A. an experiment.
B. a sample.
C. descriptive statistics.
D. statistical inference.
15. All of the following are examples of observational studies except:
A. a Gallup poll measuring the approval rating of the President.
B. an online survey to record your satisfaction with a company's service.
C. the behavior of Walmart shoppers after they are given a $20 gift card from the store.
D. the number of cars running a stop sign in a residential area during rush hour.
16. Statistical Inference:
A. is the process of drawing conclusions about the population based on the evidence taken from the sample.
B. is the same as a census.
C. is the same as a description using tabular and graphical statistics.
D. refers to the process of drawing conclusions about the sample based on the characteristics of the population. 17. Examples of categorical data include all of the following except: A. 228 lbs. B. 90,210 (Beverly Hills) .u C. blonde. D. extra large.
17. Examples of categorical data include all of the following except:
A. 228 lbs.
B. 90,210 (Beverly Hills) .u
C. blonde.
D. extra large.
18. In data mining, statistical models play an important role in developing _____:
A. businesses.
B. financial organizations.
C. human resources.
D. predictive models.
19. The number of observations in a complete data set having 20 elements and 3 variables is:
A. 20*3 or 60.
B. 20 + 3 or 23.
C. 20 - 3 or 17.
D. 20.
20. Which of these is a continuous and quantitative variable?
A. The number keys on a piano.
B. The number of internet sales in Cyber on Monday.
C. The pairs of shoes in your closet.
D. The time it takes to grill a steak.
21. In a random sample of 200 items, 5 items were defective. An estimate of the percentage of defective items in the population is:
A. 2.5%.
B. 5.0%.
C. 10.0%.
D. 20.5%.
22. A graphical presentation of the relationship between two quantitative variables is called a: A. dot plot.
B. histogram.
C. scatter diagram.
D. stem-and-leaf display
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Income Tax Fundamentals 2013
ISBN: 9781285586618
31st Edition
Authors: Gerald E. Whittenburg, Martha Altus Buller, Steven L Gill