# Quiz 1: Introduction

Statistics

Q 1Q 1

Under descriptive statistics,we study
A)the description of decision making tricks
B)the methods for organizing,displaying,and describing data
C)how to describe the probability distribution
D)samples to assist in decision making

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Multiple Choice

B

Q 2Q 2

Under inferential statistics,we study
A)the methods to make decisions about one or more populations based on sample results
B)how to make decisions about a mean,median,or mode
C)how a sample is taken from a population
D)tables composed of summary measures

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Multiple Choice

A

Q 3Q 3

In statistics,a population consists of:
A)all people living in a country
B)all people living in the area under study
C)all subjects or objects whose characteristics are being studied
D)a selection of a limited number of elements

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Multiple Choice

C

Q 4Q 4

In statistics,we define a sample as:
A)people living in one city only
B)the target population
C)all items under investigation
D)a portion of the population

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Multiple Choice

Q 5Q 5

In statistics,conducting a survey means:
A)collecting information from elements
B)making mathematical calculations
C)drawing pictures and graphs
D)none of these

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Multiple Choice

Q 6Q 6

In statistics,conducting a census means:
A)making decisions based on sample results
B)checking if a variable is qualitative or quantitative
C)collecting information from all members of the population
D)collecting a sample with replacement

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Multiple Choice

Q 7Q 7

In statistics,a representative sample is a sample that:
A)contains the characteristics of the population as closely as possible
B)represents the results of a sample exactly
C)contains all people living in an area
D)contains elements collected with replacement

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Multiple Choice

Q 8Q 8

A random sample is a sample drawn in such a way that:
A)each member of the population has a 0.10 chance of being included in the sample
B)all elements of a population are included
C)some members of the population have no chance of being included in the sample
D)each member of the population has some chance of being included in the sample

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Multiple Choice

Q 9Q 9

A simple random sample is a sample drawn in such a way that:
A)each member of the population has some chance of being included in the sample
B)every tenth element of an arranged population is included
C)each sample of the same size has an equal chance of being selected
D)each member of the population has a 0.10 chance for being included in the sample

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Multiple Choice

Q 10Q 10

A data set is a:
A)set of decisions made about the population
B)set of graphs and pictures
C)collection of observations on one or more variables
D)score collected from an element of the population

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Multiple Choice

Q 11Q 11

An observation is a:
A)graph observed for a data set
B)value of a variable for a single element
C)table prepared for a data set
D)sample observed from the population

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Multiple Choice

Q 12Q 12

A quantitative variable is the only type of variable that can:
A)assume numeric values for which arithmetic operations make sense
B)be graphed
C)be used to prepare tables
D)have no intermediate values

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Multiple Choice

Q 13Q 13

A discrete variable is a variable that can assume:
A)categorical values only
B)a countable set of values only
C)an uncountable set of values
D)non-numerical values

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Multiple Choice

Q 14Q 14

A continuous variable is a variable that can assume:
A)categorical values only
B)a countable set of values only
C)an uncountable set of values
D)non-numerical values

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Multiple Choice

Q 15Q 15

A qualitative variable is the only type of variable that:
A)can assume numerical values
B)cannot be graphed
C)can assume an uncountable set of values
D)cannot be measured numerically

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Multiple Choice

Q 16Q 16

Time-series data are collected:
A)on the same element for the same variable at different points in time
B)on a variable that involves time,e.g.,minutes,hours,weeks,months,etc.
C)for a qualitative variable
D)on different elements for the same period of time

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Multiple Choice

Q 17Q 17

Cross-section data are collected:
A)on the same variable for the same variable at different points in time
B)on different elements at the same point in time
C)for a qualitative variable
D)on different elements for the same variable for different periods of time

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Multiple Choice

Q 18Q 18

Use the following to answer questions 18-21:
The telephone bills for the past month for four families are $48,$65,$39,and $81.
-The value of is:

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Short Answer

Q 19Q 19

Use the following to answer questions 18-21:
The telephone bills for the past month for four families are $48,$65,$39,and $81.
-The value of is:

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Short Answer

Q 20Q 20

Use the following to answer questions 18-21:
The telephone bills for the past month for four families are $48,$65,$39,and $81.
-The value of is:

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Short Answer

Q 21Q 21Use the following to answer questions 18-21:
The telephone bills for the past month for four families are $48,$65,$39,and $81.
-The value of is:

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Short Answer

Q 22Q 22

Use the following to answer questions 22-25:
The test scores of five students are 85,64,95,75,and 93.
-The value of is:

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Short Answer

Q 23Q 23

Use the following to answer questions 22-25:
The test scores of five students are 85,64,95,75,and 93.
-The value of is:

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Short Answer

Q 24Q 24

Use the following to answer questions 22-25:
The test scores of five students are 85,64,95,75,and 93.
-The value of is:

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Short Answer

Q 25Q 25Use the following to answer questions 22-25:
The test scores of five students are 85,64,95,75,and 93.
-The value of is:

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Short Answer

Q 26Q 26

Use the following to answer questions 26-32:
Consider the following five pairs of m and f values:
-The value of is:

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Short Answer

Q 27Q 27

Use the following to answer questions 26-32:
Consider the following five pairs of m and f values:
-The value of is:

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Short Answer

Q 28Q 28

Use the following to answer questions 26-32:
Consider the following five pairs of m and f values:
-The value of is:

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Short Answer

Q 29Q 29Use the following to answer questions 26-32:
Consider the following five pairs of m and f values:
-The value of is:

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Short Answer

Q 30Q 30Use the following to answer questions 26-32:
Consider the following five pairs of m and f values:
-The value of is:

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Short Answer

Q 31Q 31Use the following to answer questions 26-32:
Consider the following five pairs of m and f values:
-The value of is:

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Short Answer

Q 32Q 32Use the following to answer questions 26-32:
Consider the following five pairs of m and f values:
-The value of is:

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Q 33Q 33

Use the following to answer questions 33-39:
Consider the following six pairs of x and y values:
-The value of is:

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Q 34Q 34

Use the following to answer questions 33-39:
Consider the following six pairs of x and y values:
-The value of is:

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Q 35Q 35

Use the following to answer questions 33-39:
Consider the following six pairs of x and y values:
-The value of is:

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Short Answer

Q 36Q 36Use the following to answer questions 33-39:
Consider the following six pairs of x and y values:
-The value of is:

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Q 37Q 37Use the following to answer questions 33-39:
Consider the following six pairs of x and y values:
-The value of is:

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Short Answer

Q 38Q 38Use the following to answer questions 33-39:
Consider the following six pairs of x and y values:
-The value of is:

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Short Answer

Q 39Q 39Use the following to answer questions 33-39:
Consider the following six pairs of x and y values:
-The value of is:

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Short Answer

Q 40Q 40

Whether or not a university's enrollment increased from last year to this year is an example of qualitative or quantitative data?

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Short Answer

Q 41Q 41

Total insect population among 12 U.S.national parks in 2003 is an example of time-series or cross-section data?

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Short Answer

Q 43Q 43

A statistician wants to determine the average annual Gross National Product for countries in Africa.He samples the 20 largest (in terms of population)African countries over 10 years,and gets their quarterly G.N.P results for each quarter of each year.The statistician is criticized because the sample is not representative.Explain why.

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Essay

Q 44Q 44

A statistician wants to determine the total annual medical costs incurred by all U.S.states from 1981 to 2001 as a result of health problems related to smoking.She polls each of the 50 states annually to obtain health care expenditures,in dollars,on smoking-related illnesses.Does this study constitute a survey or a census.Explain.

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Essay

Q 45Q 45

Classify the following as cross-section or time-series data.
Monthly telephone bill for each family in an apartments complex.

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Short Answer

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Short Answer

Q 48Q 48

An independent group wants to determine if the consumption of gasoline has increased due to changes in price.The group randomly selects 320 gas stations from 12 different states and collects data from the month of the year when gas is the cheapest and from the month of the year when gas is the most expensive.The data shows no significant difference in gas consumption between the two months. In this example,what is the variable being studied?
A)The 320 gas stations chosen.
B)The 12 different states.
C)The consumption of gasoline.
D)The price of gasoline.

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Multiple Choice

Q 49Q 49

The Ohio lottery involves selecting 5 numbers from 5 different bins.This is an example of sampling
A)with replacement.
B)without replacement.

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Multiple Choice

Q 50Q 50

The Megabucks lottery involves selecting 3 numbers from a single bin.This is an example of sampling
A)with replacement.
B)without replacement.

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Multiple Choice