Exam 2: Presenting Data in Tables and Charts

A personal computer user survey was conducted. Number of personal computers owned is an example of a ________ numerical variable.

The amount of time a student spent studying for an exam is an example of a continuous variable.

The quality ("terrible", "poor", "fair", "acceptable", "very good" and "excellent") of a day care center is an example of a numerical variable.

TABLE 2-7 A sample of 200 students at a Big-Ten 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. -Referring to Table 2-7, 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 research analyst was directed to arrange raw data collected on the yield of wheat, ranging from 40 to 93 bushels per acre, in a frequency distribution. He should choose 30 as the class interval width.

A ________ is a summary table in which numerical data are tallied into class intervals or categories.

In general, a frequency distribution should have at least 8 class groups but no more than 20.

Determining the class boundaries of a frequency distribution is highly subjective.

TABLE 2-13 The table below contains the opinions of a sample of 200 people broken down by gender about the latest congressional plan to eliminate anti-trust exemptions for professional baseball. -Referring to Table 2-13, ________ percent of the 200 were females who were either neutral or against the plan.

The answer to the question "How many hours on average do you spend watching TV every week?" is an example of a ratio scaled variable.

TABLE 2-2 An insurance company evaluates many numerical variables about a person before deciding on an appropriate rate for automobile insurance. A representative from a local insurance agency selected a random sample of insured drivers and recorded, X, the number of claims each made in the last 3 years, with the following results. -A type of vertical bar chart in which the categories are plotted in the descending rank order of the magnitude of their frequencies is called a

TABLE 2-13 The table below contains the opinions of a sample of 200 people broken down by gender about the latest congressional plan to eliminate anti-trust exemptions for professional baseball. -Referring to Table 2-13, if the sample is a good representation of the population, we can expect ________ percent of those for the plan in the population will be males.

TABLE 2-15 The table below contains the number of people who own a portable DVD player in a sample of 600 broken down by gender. -Referring to Table 2-15, if the sample is a good representation of the population, we can expect ________ percent of the males in the population will own a portable DVD.

The answer to the question "What is your favorite color?" is an example of an ordinal scaled variable.

Which of the following is a discrete numerical variable?

TABLE 2-8 The Stem-and-Leaf display below contains data on the number of months between the date a civil suit is filed and when the case is actually adjudicated for 50 cases heard in superior court. Note: 1L means the "low teens" - 10, 11, 12, 13, or 14; 1H means the "high teens" - 15, 16, 17, 18, or 19; 2L means the "low twenties" - 20, 21, 22, 23, or 24, etc. -Referring to Table 2-8, locate the first leaf, i.e., the lowest valued leaf with the lowest valued stem. This represents a wait of ________ months.

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?

TABLE 2-6 The following are the durations in minutes of a sample of long-distance phone calls made within the continental United States reported by one long-distance carrier. -Referring to Table 2-6, if 1,000 calls were randomly sampled, how many calls lasted under 10 minutes?

Which of the following is appropriate for displaying data collected on the different brands of cars students at a major university drive?

The chancellor of a major university was concerned about alcohol abuse on her campus and wanted to find out the proportion of students at her university who visited campus bars on the weekend before the final exam week. Her assistant took a random sample of 250 students. The portion of students in the sample who visited campus bars on the weekend before the final exam week is an example of ________.