Deck 1: Introduction

Question 1

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

Answer 1

each member of the population has some chance of being included in the sample

Question 2

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

Answer 2

a portion of the population

Question 3

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

Answer 3

a countable set of values only

Question 4

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

Question 5

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

Question 6

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

Question 7

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

Question 8

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

Question 9

In statistics,conducting a survey means:

A)collecting information from elements
B)making mathematical calculations
C)drawing pictures and graphs
D)none of these

Question 10

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

Question 11

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

Question 12

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

Question 13

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

Question 14

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

Question 15

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

Question 16

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

Question 17

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

Question 18

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

Question 19

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

Question 20

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

Question 21

Use the following to answer questions :
Consider the following six pairs of x and y values:

The value of is:

Question 22

Use the following to answer questions :
Consider the following five pairs of m and f values:

The value of is:

Question 23

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

Question 24

Use the following to answer questions :
Consider the following six pairs of x and y values:

The value of is:

Question 25

Use the following to answer questions :
Consider the following six pairs of x and y values:

The value of is:

Question 26

Use the following to answer questions :
Consider the following five pairs of m and f values:

The value of is:

Question 27

Use the following to answer questions :
Consider the following five pairs of m and f values:

The value of is:

Question 28

Use the following to answer questions :
Consider the following five pairs of m and f values:

The value of is:

Question 29

Use the following to answer questions :
Consider the following six pairs of x and y values:

The value of is:

Question 30

Use the following to answer questions :
Consider the following five pairs of m and f values:

The value of is:

Question 31

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

Question 32

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

Question 33

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

Question 34

Use the following to answer questions :
Consider the following six pairs of x and y values:

The value of is:

Question 35

Use the following to answer questions :
Consider the following five pairs of m and f values:

The value of is:

Question 36

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

Question 37

Use the following to answer questions :
Consider the following six pairs of x and y values:

The value of is:

Question 38

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

Question 39

Use the following to answer questions :
Consider the following six pairs of x and y values:

The value of is:

Question 40

Use the following to answer questions :
Consider the following five pairs of m and f values:

The value of is:

Question 41

The two types of variables are continuous and ______.

Question 42

Classify the variable as discrete or continuous.
Duration of your last 30 cell phone calls.

Question 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.

Question 44

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.

Question 45

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

Question 46

Is the variable "lengths of top-ten hit songs" discrete or continuous?

Question 47

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.

Question 48

The Ohio lottery involves selecting 5 numbers from 5 different bins.This is an example of sampling

A)with replacement.
B)without replacement.

Question 49

The Megabucks lottery involves selecting 3 numbers from a single bin.This is an example of sampling

A)with replacement.
B)without replacement.

Question 50

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