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

23. A dot plot of the ages of 10 employees of a company is shown below. Ages are rounded to the tens place prior to constructing the graph. 10 20 30 40 50 60 Age of Employees (in years) What is the shape of the distribution? Explain. A. The distribution of employee ages is skewed to the left because the most common age is 20, which is on the left side of the graph. B. The distribution of employee ages is skewed to the right because the most common age is 20, which is on the left side of the graph. C. The distribution of employee ages is skewed to the left because the tail of the distribution extends further toward higher numbers. D. The distribution of employee ages is skewed to the right because the tail of the distribution extends further toward higher numbers.24. Which of the following is least useful in making comparisons or showing the relationships of two variables? A. crosstabulation B. scatter diagram C. stacked bar chart D. stem-and-leaf display25. The bar chart below displays the amount of peanut butter fudge purchased by 40 independent shoppers at a local candy store. Determine the relative frequency percentages for each of the three categories. 20 17 14 9 Frequency 10 6 ounces 8 ounces 10 ounces Preferences A. 6 ounces = 14%, 8 ounces = 17%, and 10 ounces = 9%. B. 6 ounces = 15%, 8 ounces = 20%, and 10 ounces = 25%. C. 6 ounces = 33.3%, 8 ounces = 33.3%, and 10 ounces = 33.3%. D. 6 ounces = 35%, 8 ounces = 42.5%, and 10 ounces = 22.5%.32. A frequency distribution is a tabular summary of data showing the: A. fraction of items in several classes. B. number of items in several classes. C. percentage of items in several classes. D. relative percentage of items in several classes.33. In a cumulative relative frequency distribution, the last class will have a cumulative relative frequency equal to: A. none of these alternatives is correct. B. one. C. the total number of observations in a data set. D. zero.Undergraduate Major Graduate School Business Engineering Others Total Yes 70 84 126 280 No 182 208 130 520 Total 252 292 256 800 Of those students who are majoring in Business, what percentage of students plans to go to graduate school? A. 8.75%. B. 27.78%. C. 70.00%. D. 72.22%.34. A survey of 800 college seniors resulted in the following crosstabulation regarding their undergraduate major and their plan of going to graduate school.35. A sample of 50 TV viewers were asked. "Should T'v' sponsors pull their sponsorship from the programs that draw numerous viewer complaints?" Below are the results of the survey. (Y = Yes; N = No; W = Without Opinion): N W N H Y H H N Y H N Y N N N N N Y H H Y N Y W N Y W W H Y W W N W T W N W Y W N Y N Y N W Y Y N V Which of the following graphical displays is not appropriate to display this data? A. Bar Chart. B Histogram. c. Pie Chart. o. W 36. A histogram is: A. a graphical method of presenting a cumulative frequency or a cumulative relative frequency distribution. B. a graphical presentation of a frequency or relative frequency distribution. C. history of data elements. D. the same as a pie chart.37. Numerical values that indicate how much or how many are known as: A. categorical data. B. cumulative data. C. quantitative data. D. relative data.38. The relative frequency of a class is computed by: A. dividing the frequency of the class by the midpoint. B. dividing the frequency of the class by the sample size. C. dividing the midpoint of the class by the sample size. D. dividing the sample size by the frequency of the class.39. A survey of a random sample of 100 people was conducted. The participants were asked whether they had a dog and whether they had allergies. The results are shown below: Own a dog Allergies No Allergies Yes 8 42 No 38 12 Compute the row and column totals as well as the row and column percentages. Then determine which of the following statements is correct. A. There appears to be no relationship between having a dog and whether a person has allergies. B. This crosstabulation provides convincing evidence that having a dog causes a reduction in allergies. C. This crosstabulation shows that those who own a dog are less likely to have allergies than those who do not own a dog. D. We cannot draw any conclusions from this crosstabulation because we do not know about each survey participant's prior medical history.26. A sample of 15 children gives the name of their favorite restaurants that are as follows: Mcdonalds Luppi's Mellow Mushroom Friday's Mcdonalds Mcdonalds Pizza Hut Taco Bell Mcdonalds Mellow Mushroom Luppi's Pizza Hut Mcdonalds Friday's Mcdonalds Which of the following is the correct frequency distribution? A. Mcdonalds 4, Friday's 3, Pizza Hut 1, Mellow Mushroom 4, Luppi's 2, Taco Bell 1. B. McDonalds 5, Friday's 3, Pizza Hut 1, Mellow Mushroom 2, Luppi's 3, Taco Bell 1. C. Mcdonalds 6, Friday's 1, Pizza Hut 3, Mellow Mushroom 1, Luppi's 2, Taco Bell 2. D. Mcdonalds 6, Friday's 2, Pizza Hut 2, Mellow Mushroom 2, Luppi's 2, Taco Bell 1.40. In a crosstabulation: A. both variables can be either categorical or quantitative. B. both variables must be categorical. C. both variables must be quantitative. D. one variable must be categorical and the other must be quantitative.41. A display used to compare the frequency, relative frequency, or percent frequency of two categorical variables is a: A. pie chart. B. scatter diagram. C. stacked bar chart. D. stem-and-leaf display.42. Which of the following is not a recommended guideline for creating an effective graphical display? A. Give the display a clear and concise tide. B. If colors are used to distinguish categories, use a legend to define them. C. We. D. Use three dimensions whenever possible to give the display depth. 43. The number of hours worked (per week) by 400 statistics students are shown below. Number of hours Frequency 0-9 20 10-19 80 20-29 200 30-39 10044. Fifteen percent of the students in a School of Business Administration are majoring in Economics. 20% in Finance. 35% in Management. and 30% in Accounting. The graphical devioe{s) that can be used to present these data is (are): A. a line chart. B. Wampum; C. only a bar chart. D. only a pie chart. 45. Which of the following graphical displays should not be used for quantitative data? A. Dot Plot. B. Histogram. C. Scatter Diagram. D. Stacked Bar Chart.46. A cumulative relative frequency distribution shows: A. the percentage of data items with values less than or equal to the lower limit of each class. B. the percentage of data items with values less than or equal to the upper limit of each class. C. the proportion of data items with values less than or equal to the lower limit of each class. D. the proportion of data items with values less than or equal to the upper limit of each class.47. The relative frequency of a class is computed by: A. dividing the cumulative frequency of the class by .. B. dividing the frequency of the class by .. C. dividing , by the cumulative frequency of the class. D. dividing the frequency of the class by the number of classes.48. A set of visual displays that organizes and presents information that is used to monitor the performance of a company or organization in a manner that is easy to read, understand, and interpret is called a: A. crosstabulation. B. data dashboard. C. data visualization. D. scatter diagram.49. The sum cf frequencies for all classes 1will always equal to: A. a value between U and 1. B. the number cf classes. C. W D. 1. 2?. Thirty students in the School of Business were asked about their majors. The following represents their responses (M = Management; A = Accounting; E = Economics; 0 = Others). A M M A M M E M O A E E M A D E M A M A M A D A M E E M A M What percent of the students in the School of Business are Accounting majors? A. 10%. B. 20%. C. 3.0%. D. 110%. 50. Which of the following would likely display a negative relationship when creating a scatter diagram? A. The number of classes a student misses during a semester and the grade obtained in the course. B. The number of miles that a car is driven and the amount of fuel consumed. C. The amount of time a student spends studying and their plan of going in the course. D. The amount of rain that falls in the spring and how quickly the grass grows.51. 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.28. A student asked their classmates how tall they are, in which month they were born, and whether they are in a relationship. How many of these variables are quantitative and how many of these variables are categorical? A. None is quantitative. Three are categorical. B. One is quantitative. Two are categorical. C. Three are quantitative. None is categorical. D. Two are quantitative. One is categorical.According to the crosstabulation above, what percent of undergraduate majors plan to go to graduate school? A. 19.3%. B. 27.8%. C. 35.0%. D. 65.0%.29. A survey of 800 college seniors resulted in the following crosstabulation regarding their undergraduate major and their plan of going to graduate school. Undergraduate Major Graduate School Business Engineering Others Total Yes 70 84 126 280 No 182 208 130 520 Total 252 292 256 80030. In a cumulative frequency distribution, the last class will always have a cumulative frequency equal to A. one. B. the total number of classes in a data set. C. the total number of observations in a data set. D. 100.31. A survey of a random sample of 100 people was conducted. The participants were asked whether they own a dog and whether they had allergies. The results are shown below: Own a dog Allergies No Allergies Yes 8 42 No 38 12 What percent of the people surveyed own a dog, but do not have allergies? A. 38%. B. 42%. C. 50%. D. 54%