A population is a set of existing units.
If we examine some of the population measurements, we are conducting a census of the
population.
A random sample is selected so that on each selection from the population every unit remaining in the
population has an equal chance of being chosen.
A process is in statistical control if it does not exhibit any unusual variations.
An example of a quantitative variable is the make of a car.
An example of a qualitative variable is the mileage of a car.
Statistical inference is the science of using a sample of measurements to make generalization about the
important aspects of a population of measurements.
If we sample without replacement, we do not place the unit chosen on a particular selection back into
the population.
By taking a systematic sample, in which we select every 100th shopper arriving at a specific store, we
are approximating a random sample of shoppers.
Statistical methods help to:
Ratio variables have the following characteristics:
When we are choosing a random sample and we do not place chosen units back into the population,
we are:
Which of the following is a quantitative variable?
Which of the following is a categorical variable?
Measurements from a population are called
In studying processes, we are interested in examining a characteristic that tells us about the _____ of
output.
The two types of quantitative variables are:
Temperature (in degrees Fahrenheit) is an example of a(n) ________ variable.
Jersey numbers of soccer players is an example of a(n) ___________ variable
Weights of items obtained using a well-adjusted scale represents a(n) _____________ level of
measurement.
An identification of police officers by rank would represent a(n) ____________ level of
measurement.
__________ is a necessary component of a runs plot.
______________ is the science of using a sample to make generalizations about the important aspects
College entrance exam scores, such as SAT scores, are an example of a(n) ________________
variable.
The number of miles a truck is driven before it is overhauled is an example of a(n) _____________
variable.
Which one of the following sampling examples would generally lead to the least reliable statistical
inferences about the population from which the sample has been selected?
A(n) ___________________ variable is a qualitative variable such that there is no meaningful
ordering or ranking of the categories.
A person’s telephone area code is an example of a(n) _____________ variable.
Any characteristic of a population unit is a(n):
A list of all of the units in a population is called _____.
In order to improve the quality of products and services, we must remove the root causes of process
_____.
Any characteristic of a population is called a _____.
The goal of _____ is to stabilize and reduce the amount of process variation.
A _____ is an examination of all the units in a population.
_____ is the difference between a numerical description of the population and the corresponding
description of the sample.
A _____ is a list of all the units in a population.
The process of assigning a value of a variable to each unit in a population or sample is called
_____.
A ____ is a display of individual process measurements versus time
Statistical _____ refers to using a sample of measurements making generalizations about the important
aspects of a population.
A _____ is a subset of the units in a population.
A _____ variable can have values that are numbers on the real number line.
A sequence of operations that takes inputs and turns them into outputs is a _____.
A _____ variable can have values that indicate into which of several segments of a population it
belongs.
A set of existing units we wish to study is called a _____.
_____ refers to describing the important aspects of a set of measurements.
In situations when it is not possible to number all of the units in a population, we often use a _____
sample to approximate a random sample.
A runs plot with an erratic pattern would indicate that the process is __
If a unit is placed back into the population after being selected for a sample, we are sampling
_____.
A _____ is used to help select items for a random sample.
A process that is in statistical control does not necessarily imply that the process is __________.
A consumer’s yes/no reply to a survey question is what type of variable?
The change in daily price of a stock is what type of variable
In a voluntary response sample, what types of opinions are usually expressed?
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