Chapter 1 Quiz

Question 1

the process of using sample statistics to draw conclusions about true population parameters is called

Answer 1

statistical inference

Question 2

Those methods involving the collection, presentation, and characterization of a s set of data in order to properly describe the various feature of that set of data are called

Answer 2

descriptive statistics

Question 3

the thought processes that focus on ways to understand, manage, and reduce variation are called

Answer 3

statistical thinking

Question 4

The collection and summarization of the socioeconomic and physical characteristics of the employees of a particular firm is an example of

Answer 4

descriptive statistics

Question 5

the estimation of the population average family expenditure on food based on the sample average expenditure of 1,000 families is an example

Answer 5

inferential statistics

Question 6

The universe of totality of items or things under consideration is called

Answer 6

population

Question 7

the portion of the universe that has been selected for analysis is called

Answer 7

a sample

Question 8

A summary measure that is computed to describe a characteristic form only a sample of the population is called

Answer 8

a statistic

Question 9

summary measure that is computed to describe a characteristic of an entire population is called

Answer 9

a parameter

Question 10

which of the following is most likely a population as opposed to a sample

1. respondents to a newspaper survey
   b. the first 5 students completing an assignment
   c. every third person to arrive at the bank
   d. registered voters in a country

Answer 10

d registered voters in a country

Question 11

Which of the following is most likely a parameter as opposed to a statistic

1. the average score of the first 5 students completing an assignment
   b. the proportion of females registered to vote in a country
   c. the average height of people randomly selected form a database
   d. the proportion of trucks stopped yesterday that were cited for bad brakes

Answer 11

b the proportion of females registered to vote in a country

Question 12

true or false

data may be defined as the information needed to make a more informed decision in a particular situation

Answer 12

true

Question 13

true or false

data are needed to assist in formulating alternative courses of action in a decision-making process

Answer 13

true

Question 14

true or false

sampling is often necessary because it is too costly to study the whole population

Answer 14

true

Question 15

true or false

sampling is often necessary because it is too time consuming to study the whole populating

Answer 15

true

Question 16

True or false

if a researcher wants to select a random sample of 50 factory workers form a population of 2,500 workers, the researcher will use sampling with replacement

Answer 16

false

Question 17

true or false

a probability sample is one in which the subjects of the sample are chosen on the basis of known probabilities

Answer 17

true

Question 18

true or false

sampling is less time consuming than drawing a census of the population

Answer 18

true

Question 19

true or false

a sample is less cumbersome and more practical to administer than a census

Answer 19

true

Question 20

true or false

a quota sample is an example of a probability sample

Answer 20

false

Question 21

Sugar maple is one of the most common trees in the forests of southeastern Canada. the maple tree typically grows 23 to 30 meters tall. however, it may reach a height of 41 meters tall. a study is attempting to determine what factors aid a tree in reaching heights greater than 30 meters tall. it is estimated that a forest contains 25,000 adult sugar maple trees. the study involves collecting heights form 250 randomly selected adult sugar maple trees and analyzing the results. identify the population from which the study was sampled.

a. the 250 randomly selected adult sugar maple trees
b. the 25,000 adult sugar maple trees in the forest
c. all the adult sugar maple trees taller than 30 meters
d. all sugar maple trees, of any age, in the forest

Answer 21

the 25,000 adult sugar maple trees in the forest

b

Question 22

sugar maple is one of the most common trees in the forests of southeastern Canada. the maple tree typically grows 23 to 30 meters tall. however, it may reach a height of 41 meters tall. a study is attempting to determine what factors aid a tree in reaching heights greater than 30 meters tall. it is estimated that a forest contains 25,000 adult sugar maple trees. the study involves collecting heights from 250 randomly selected adult sugar maple trees and analyzing the results. identify the variable of interest in the study.

A. the age of a sugar maple tree in the forest

b. the eight of a sugar maple tree in the forest
c. the number of surge maple trees in the forest
d. the species of trees in the forest

Answer 22

b. the height of a sugar maple tree in the forest