statistics-2 by keller.doc
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1、如有侵权,请联系网站删除,仅供学习与交流statistics-2 by keller【精品文档】第 41 页CHAPTER 2GRAPHICAL AND TABULAR DESCRIPTIVE TECHNIQUESSECTIONS 1 MULTIPLE CHOICE QUESTIONSIn the following multiple-choice questions, please circle the correct answer.1.Which of the following statements is false?a. All calculations are permitted o
2、n interval datab. All calculations are permitted on nominal datac. The most important aspect of ordinal data is the order of the data valuesd. The only permissible calculations on ordinal data are ones involving a ranking processANSWER:b2.The average number of units earned per semester by college st
3、udents is suspected to be rising. A researcher at Boston College wishes to estimate the number of units earned by students during the spring semester of 2004 at Boston. To do so, he randomly selects 250 student transcripts and records the number of units each student earned in the spring term of 200
4、4. The variable of interest to the researcher is the a. number of students enrolled at Boston College during the spring term of 2004b. average indebtedness of Boston College students enrolled in the springc. age of Boston College students enrolled in the springd. number of units earned by Boston Col
5、lege students during the spring term of 2004ANSWER:d3.The classification of student major (accounting, economics, management, marketing, other) is an example of a. a categorical random variable.b. a discrete random variablec. a continuous random variabled. a parameter.ANSWER:a4.A study is under way
6、in national forest to determine the adult height of pine trees. Specifically, the study is attempting to determine what factors aid a tree in reaching heights greater than 50 feet tall. It is estimated that the forest contains 32,000 adult pines. The study involves collecting heights from 500 random
7、ly selected adult pine trees and analyzing the results. The variable of interest in the study is the a. age of a pine tree in the national forest.b. height of a pine tree in the national forest.c. number of pine trees in the national forest.d. species of trees in the national forest.ANSWER:b5.The cl
8、assification of student class designation (freshman, sophomore, junior, senior) is an example of a. a categorical random variable.b. a discrete random variable.c. a continuous random variable.d. a parameter.ANSWER:a6.Most analysts focus on the cost of tuition as the way to measure the cost of a coll
9、ege education. But incidentals, such as textbook costs, are rarely considered. A researcher at Ferris State University wishes to estimate the textbook costs of first-year students at Ferris. To do so, he monitored the textbook cost of 200 first-year students and found that their average textbook cos
10、t was $275 per semester. The variable of interest to the researcher is the a. textbook cost of first-year Ferris State University students.b. year in school of Ferris State University students.c. age of Ferris State University students.d. cost of incidental expenses of Ferris State University studen
11、ts.ANSWER:a7.The manager of the customer service division of a major consumer electronics company is interested in determining whether the customers who have purchased a videocassette recorder made by the company over the past 12 months are satisfied with their products. The possible responses to th
12、e question “Are you happy, indifferent, or unhappy with the performance per dollar spent on the videocassette recorder?” are values from a a. discrete numerical random variable.b. continuous numerical random variablec. categorical random variable.d. parameter.ANSWER:cTRUE / FALSE QUESTIONS8.There ar
13、e actually four types of data: nominal, ordinal, interval, and ratio. However, for statistical purposes, there is no difference between interval and ratio data, and the authors of your book combine the two types.ANSWER:T9.Quantitative variables usually represent membership in groups or categories. A
14、NSWER:F 10.Interval data, such as heights, weights, and incomes, are also referred to as quantitative or numerical data. ANSWER:T 11.Nominal data are also called qualitative or categorical data.ANSWER:T 12.ATP singles rankings for tennis players is an example of an interval scale. ANSWER:F13.Interva
15、l data may be treated as ordinal or nominal.ANSWER:T 14.Nominal data may be treated as ordinal or intervalANSWER:F15.Professor Hogg graduated from the University of Iowa with a code value = 2 while Professor Maas graduated from Michigan State University with a code value = 1. The scale of measuremen
16、t likely represented by this information is interval.ANSWER:F16.Ordinal data may be treated as interval but not as nominal.ANSWER:F 17.A variable is some characteristic of a population, while data are the observed values of a variable based on a sample.ANSWER:F18.An automobile insurance agent believ
17、es that company “A” is more reliable than company “B”. The scale of measurement that this information represents is the ordinal scale. ANSWER:TSTATISTICAL CONCEPTS & APPLIED QUESTIONS19.The Dean of Students conducted a survey on campus. SAT score in mathematics is an example of a _, or _ variable.AN
18、SWER:quantitative, numerical20.Provide one example for nominal, ordinal, and interval data.ANSWER:Nominal data example: Political party affiliation for voters recorded using the code: 1 = Democrat, 2 = Republican, and 3 = Independent. Ordinal data example: Response to market research survey measured
19、 on the Likert scale using the code: 1 = Strongly agree, 2 = Agree, 3 = Neutral, 4 = Disagree, and 5 = Strongly disagree.Interval data example: Temperature in tennis courts during the US Open21.The dean of students conducted a survey on campus. The gender of the student is an example of a _, or _ va
20、riable.ANSWER:categorical, qualitative22.For each of the following examples, identify the data type as nominal, ordinal, or interval.a. The letter grades received by students in a computer science classb. The number of students in a statistics coursec. The starting salaries of newly Ph.D. graduates
21、from a statistics programd. The size of fries (small, medium, large) ordered by a sample of Burger King customerse. The college you are enrolled in (Arts and science, Business, Education, etc.) ANSWER:a. Ordinal b. Interval c. Interval d. Ordinal e. Nominal23.The Dean of Students conducted a survey
22、on campus. Class designation (Freshman, Sophomore, Junior, and Senior) is an example of a _, or _ variable.ANSWER:categorical, qualitative24.Most colleges admit students based on their achievements in a number of different areas. The grade obtained in senior level English course (A, B, C, D, or F) i
23、s an example of a _, or _ variable.ANSWER:categorical, qualitative25.At the end of an escorted motor coach vacation, the tour operator asks the vacationers to respond to the questions listed below. For each question, determine whether the possible responses are interval, nominal, or ordinal.a. How m
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