Chapter 1 Quiz Flashcards
the process of using sample statistics to draw conclusions about true population parameters is called
statistical inference
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
descriptive statistics
the thought processes that focus on ways to understand, manage, and reduce variation are called
statistical thinking
The collection and summarization of the socioeconomic and physical characteristics of the employees of a particular firm is an example of
descriptive statistics
the estimation of the population average family expenditure on food based on the sample average expenditure of 1,000 families is an example
inferential statistics
The universe of totality of items or things under consideration is called
population
the portion of the universe that has been selected for analysis is called
a sample
A summary measure that is computed to describe a characteristic form only a sample of the population is called
a statistic
summary measure that is computed to describe a characteristic of an entire population is called
a parameter
which of the following is most likely a population as opposed to a sample
- 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
d registered voters in a country
Which of the following is most likely a parameter as opposed to a statistic
- 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
b the proportion of females registered to vote in a country
true or false
data may be defined as the information needed to make a more informed decision in a particular situation
true
true or false
data are needed to assist in formulating alternative courses of action in a decision-making process
true
true or false
sampling is often necessary because it is too costly to study the whole population
true
true or false
sampling is often necessary because it is too time consuming to study the whole populating
true
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
false
true or false
a probability sample is one in which the subjects of the sample are chosen on the basis of known probabilities
true
true or false
sampling is less time consuming than drawing a census of the population
true
true or false
a sample is less cumbersome and more practical to administer than a census
true
true or false
a quota sample is an example of a probability sample
false
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
the 25,000 adult sugar maple trees in the forest
b
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
b. the height of a sugar maple tree in the forest
