1. The universe or "totality of items or things" under consideration is called a) a sample. b) a population. c) a parameter. d) a statistic. ANSWER: b TYPE: MC DIFFICULTY: Easy KEYWORDS: population 2. The portion of the universe that has been selected for
1. 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 a) contingency table. b) Pareto diagram. c) dot plot. d) pie chart. ANSWER: b TYPE: MC DIFFICULTY: Easy KEYW
1. The width of each bar in a histogram corresponds to the a) differences between the boundaries of the class. b) number of observations in each class. c) midpoint of each class. d) percentage of observations in each class. ANSWER: a TYPE: MC DIFFICULTY:
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Presenting Data in Tables and Charts
CHAPTER 2: PRESENTING DATA IN TABLES AND CHARTS
TABLE 2-1 An insurance company evaluates many numerical variables about a person before deciding on an appropriate rate for automobile insurance. A representative from
1. A personal computer user survey was conducted. Primary word processing package used is an example of a _ variable. ANSWER: categorical TYPE: FI DIFFICULTY: Easy KEYWORDS: categorical random variable, types of data 2. A personal computer user survey was
1. The Dean of Students conducted a survey on campus. Number of credits currently enrolled for is an example of a _ numerical variable. ANSWER: discrete TYPE: FI DIFFICULTY: Easy KEYWORDS: discrete random variable, types of data 2. The Dean of Students co
1. Most colleges admit students based on their achievements in a number of different areas. The total SAT score achieved by a student is an example of a _ numerical variable. ANSWER: continuous TYPE: FI DIFFICULTY: Moderate KEYWORDS: continuous random var
1. An insurance company evaluates many numerical variables about a person before deciding on an appropriate rate for automobile insurance. The number of tickets a person has received in the last 3 years is an example of a _ variable. ANSWER: discrete TYPE
1. The Commissioner of Health in New York State wanted to study malpractice litigation in New York. A sample of 31,000 medical records was drawn from a population of 2.7 million patients who were discharged during the year 1997. The collection, presentati
1. The Quality Assurance Department of a large urban hospital is attempting to monitor and evaluate patient satisfaction with hospital services. Prior to discharge, a random sample of patients is asked to fill out a questionnaire to rate such services as
1. Coverage error results in a _. ANSWER: selection bias TYPE: FI DIFFICULTY: Difficult KEYWORDS: selection bias, survey worthiness 2. _ results from the failure to collect data on all subjects in the sample. ANSWER: Nonresponse error or bias TYPE: FI DIF
ECO251 QBA1 FIRST HOUR EXAM Name: _Key_ Social Security Number: _ Part I. 1. (34 points) Which of the following is NOT a reason for the need for sampling? a) It is usually too costly to study the whole population. b) It is usually too time consuming to lo
TABLE 2-1 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, t
TABLE 2-4 A survey was conducted to determine how people rated the quality of programming available on television. Respondents were asked to rate the overall quality from 0 (no quality at all) to 100 (extremely good quality). The stem-and-leaf display of
TABLE 2-13 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.
12. If the researcher was directed to present the data in 5 classes, what should the class
16.
In a perfectly symmetrical distribution a) the range equals the interquartile range. b) the interquartile range equals the mean. c) *the median equals the mean. d) the variance equals the standard deviation
17. Evaluate the following statements: (i) I
1. Referring to the histogram from Table 2-3, if all the tickets purchased were used, how many guests attended the luncheon? a) 4 b) 152 c) 275 d) 388 ANSWER: d TYPE: MC DIFFICULTY: Difficult EXPLANATION: The total number of guests is KEYWORDS: interpreta
CHAPTER 1: INTRODUCTION AND DATA COLLECTION
1. The process of using sample statistics to draw conclusions about true population parameters is called a) statistical inference. b) the scientific method. c) sampling. d) descriptive statistics. ANSWER: a TYPE
DIT 2010 Business Statistics Problem Set/ Study Guide #1 Due: TBA
Notes: (1) (2)
Prof. MW Varano Spring 2009
The purpose of this short problem set is to verify that the student has a basic understanding of descriptive statistics, and basic probability. Th
1. Mediterranean fruit flies were discovered in California a few years ago and badly damaged the oranges grown in that state. Suppose the manager of a large farm wanted to study the impact of the fruit flies on the orange crops on a daily basis over a 6-w
1. The Human Resources Director of a large corporation wishes to develop an employee benefits package and decides to select 500 employees from a list of all (N = 40,000) workers in order to study their preferences for the various components of a potential
1. The chancellor of a major university was concerned about alcohol abuse on her campus and wanted to find out the portion of students at her university who visited campus bars on the weekend before the final exam week. Her advisor took a random sample of
1. Researchers are concerned that the weight of the average American school child is increasing,
implying, among other things, that children's clothing should be manufactured and marketed in larger sizes. If X is the weight of school children sampled in a
1. Researchers are concerned that the weight of the average American school child is increasing,
implying, among other things, that children's clothing should be manufactured and marketed in larger sizes. If X is the weight of school children sampled in a
1. Tim was planning for a meeting with his boss to discuss a raise in his annual salary. In preparation, he wanted to use the Consumer Price Index to determine the percentage increase in his salary in terms of real income over the last three years. Which
1. Jared was working on a project to look at global warming and accessed an Internet site where he captured average global surface temperatures from 1866. Which of the four methods of data collection was he using? a) published sources b) experimentation c
1. 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 st
1. A study is under way in Yosemite National Forest to determine the adult height of American pine trees. Specifically, the study is attempting to determine what factors aid a tree in reaching heights greater than 60 feet tall. It is estimated that the fo
1. Which of the following is NOT a reason for drawing a sample? a) A sample is less time consuming than a census. b) A sample is less costly to administer than a census. c) A sample is usually not a good representation of the target population. d) A sampl
1. For a population frame containing N = 1,007 individuals, what code number should you assign to the first person on the list in order to use a table of random numbers? a) 0 b) 1 c) 01 d) 0001 ANSWER: d TYPE: MC DIFFICULTY: Easy KEYWORDS: random number 2