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Exam 1: Data and Statistics

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Question 1

Multiple Choice

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Data

A) are always be numeric
B) are always nonnumeric
C) are the raw material of statistics
D) None of these alternatives is correct.

E) A) and B)
F) All of the above

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Question 2

Multiple Choice

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In a questionnaire,respondents are asked to mark their gender as male or female.Gender is an example of the

A) ordinal scale
B) nominal scale
C) ratio scale
D) interval scale

E) None of the above
F) A) and B)

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Question 3

Multiple Choice

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The collection of all elements of interest in a particular study is

Data collected at the same,or approximately the same,point in time are

A portion of the population selected to represent the population is called

Since a sample is a subset of the population,the sample mean

Methods for developing useful decision-making information from large data bases is known as

Another name for "observations" is

Which of the following variables use the ratio scale of measurement?

Arithmetic operations are inappropriate for

Arithmetic operations are appropriate for

A recent issue of a national magazine reported that in a national public opinion survey conducted among 2,000 individuals,56% were in favor of gun control,40% opposed gun control,and 4% had no opinion on the subject. a.What is the sample in this survey? b.Based on the sample,what percentage of the population would you think is in favor of gun control? c.Based on the sample,what percentage of the population would you think have no opinion on the subject?

The subject of data mining deals with

The sample size

Exhibit 1-4 In many universities,students evaluate their professors by means of answering a questionnaire.Assume a questionnaire is distributed to a class of 45 students.Students are asked to answer the following:1.Sex2.Race (Black,White,Other) 3.Age4.Number of hours completed5.Grade point average6.My instructor is a very effective teacher -Refer to Exhibit 1-4.How many elements are in the above data set?

Which scale of measurement can be either numeric or nonnumeric?

Exhibit 1-2 In a sample of 1,600 registered voters,912,or 57%,approve of the way the President is doing his job. -Refer to Exhibit 1-2.A political pollster states: "Fifty-seven percent of all voters approve of the President." This statement is an example of

Social security numbers consist of numeric values.Therefore,social security is an example of

The following shows the temperatures (high,low)and weather conditions in a given Sunday for some selected world cities.For the weather conditions,the following notations are used: c = clear;cl = cloudy;sh = showers;pc = partly cloudy. a.How many elements are in this data set? b.How many variables are in this data set? c.How many observations are in this data set? d.Name the variables and indicate whether they are categorical or quantitative. e.For which variables are arithmetic operations appropriate and for which are they not appropriate?

The following information regarding the ten richest Americans was reported in a recent issue of Forbes. a.How many elements are in the above data set? b.How many variables are in this data set? c.How many observations are in this data set? d.Which variables are categorical and which are quantitative? e.What measurement scale is used for each variable?