1) A newspaper poll asked 2,150 adults in a country a series of questions to find out their view on the country's economy. The possible responses to the question "How many more months do you think the country's economy will require to get out of a recession?" are values from which of the following? A. continuous numerical variable B. discrete numerical variable C. table of random numbers D. categorical variable 2) The manager of the customer service division of a major consumer electronics company is interested in determining whether the customers who have purchased a media player made by the company over the past 12 months are satisfied with their products. The possible responses to the question "How many media players made by other manufacturers have you used?" result in which of the following? A. a ratio scale variable B. an interval scale variable C. an ordinal scale variable D. a nominal scale variable 3) A newspaper poll asked 2,150 adults in a country a series of questions to find out their view on their country's economy. The population of interest is which of the following? A. All the males living in the country when the poll was taken. B. All the females living in the country when the poll was taken. C. All the people living in the country when the poll was taken. D. All the adults living in the country when the poll was taken. 4) Most analysts focus on the cost of tuition as the way to measure the cost of a college education. But incidentals, such as textbook costs, are rarely considered. A researcher at Drummand University wishes to estimate the textbook costs of first-year students at Drummand. To do so, she monitored the textbook cost of 250first-year students and found that their average textbook cost was $600 per semester. Identify the sample in the study. A. All college students. B. All first-year Drummand University students. C. The 250 students that were monitored. D. All Drummand University students. 5) Complete the sentence. A sample of 300 subscribers to a particular magazine is selected from a population frame of 9,000 subscribers. If, upon examining the data, it is determined that no subscriber had been selected in the sample more than once, _______. A. the sample could not have been random B. the sample may have been selected without replacement or with replacement C. the sample had to have been selected without replacement D. the sample had to have been selected with replacement 6) Determine whether the following statements are true or false. The professor of a business statistics class wanted to find out the mean amount of time per week her students spent studying for the class. She divided the students into the left, right and center groups according to the location they sat in the class that day. One of these 3 groups was randomly selected and everyone in the group was asked the mean amount of time per week he/she spent studying for the class. This is an example of a cluster sample. True False 7) A sample of 200 students at a large university was taken after the midterm to ask them whether they went bar hopping the weekend before the midterm or spent the weekend studying, and whether they did well or poorly on the midterm. The following table contains the result. Did Well on Midterm Did Poorly on Midterm Studying for Exam 80 20 Went Bar Hopping 30 70 If the sample is a good representation of the population, we can expect ________ percent of those who did poorly on the midterm to have spent the weekend studying. A. 45 B. 10 C. 50 D. 22.22 8) Which of the following should be created when studying the simultaneous responses of two categorical questions? A. A contingency table B. A cumulative percentage distribution table C. A histogram D. A frequency distribution table 9) The following data are the duration in minutes of a sample of long-distance phone calls made within a country reported one long-distance carrier. What is the width of each class? Relative Time (in Minutes) Frequency 0 but less than 5 0.37 5 but less than 10 0.22 10 but less than 15 0.15 15 but less than 20 0.10 20 but less than 25 0.07 A. 1 minute B. 100% C. 2% D. 5 minutes 10) Determine whether the statement is true or false. The sum of relative frequencies in a distribution always equals 1. True False 11) Determine whether the statement is true or false. When constructing a frequency distribution, classes should be selected so that they are of equal width. True False 12) Determine whether the statement is true or false. To determine the width of class interval, divide the number of class groups by the range of the data. True False 13) A survey of 150 executives were asked what they think is the most common mistake candidates make during job interviews. Six different mistakes were given. Which of the following is the best for presenting the information? A. A stem-and-leaf display B. A contingency table C. A histogram D. A bar chart 14) Determine whether the following statements are true or false. A computer company collected information on the age of their customers. The youngest customer was 12 and the oldest was 72. To study the distribution of the age among its customers, it is best to use a pie chart. True False 15) Determine whether the statement is true or false. The stem-and-leaf display is often superior to the frequency distribution in that it maintains the original values for further analysis. True False 16) When constructing charts, which of the following is plotted at the class midpoints? A. percentage polygons B. frequency histograms C. cumulative percentage polygon (ogives) D. All of the above 17) Determine whether the statement is true or false. A histogram can have gaps between the bars, whereas bar charts cannot have gaps. True False 18) Determine whether the statement is true or false. A percentage polygon is formed by having the lower boundary of each class represent the data in that class and then connecting the sequence of lower boundaries at their respective class percentages. True False 19) Data was collected on the monthly seasonally adjusted civilian unemployment rate for a country over a 10-year period. Which of the following is the best for presenting the data? A. A stem-and-leaf display B. A time-series plot C. A contingency table D. A side-by-side bar chart 20) Which of the following statistics is not a measure of central tendency? A. Mode B. Arithmetic mean C. Q3 D. Median 21) Determine whether the statement is true or false. The coefficient of variation is expressed as a percentage. True False 22) Determine whether the statement is true or false. If a set of data is perfectly symmetrical, the arithmetic mean must be identical to the median. True False 23) Determine whether the statement is true or false. If a set of data is perfectly symmetrical, the arithmetic mean must be identical to the median. True False 24) Determine whether the statement is true or false. The median of the values 3.4, 4.7, 1.9, 7.6, and 6.5 is 4.05. True False 25) Determine whether the statement is true or false. As a general rule, a value is considered an extreme value if its Z score is greater than 3. True False 26) Determine whether the following statement is true or false. As a general rule, a value is considered an extreme value if its Z score is less than minus3. True False