Business Statistics 3370 MidTerm

True

15. A population is a set of existing units. True or False

Sample

A ____________ is a subset of the units in a population.

Bar chart, histogram

A _____________ displays the frequency of each group with qualitative data, and a _____________ displays the frequency of each group with quantitative data.

Pareto chart

A ______________ can be used to differentiate the vital few causes of quality problems from the trivial many causes of quality problems.

Scatter plot

A ______________ shows the relationship between two variables.

Elements

A data set provides information about some group of individual _____________.

A defect

A flaw possessed by a population or sample unit is ___________.

Box-and-Whisker Display

A graphical portrayal of a data set that depicts both the central tendency and variability of the data.

Skewed to the left

A histogram that tails out toward smaller values is ___________.

Nominative

A person's telephone area code is an example of a(n) _____________ variable.

Element

A person, object or other entity about which we wish to draw a conclusion.

Scatter

A plot of the values of two variables is a _____ plot.

Ordinal Variable

A qualitative variable for which there is a meaningful ordering or ranking of the categories.

Nominative Variable

A qualitative variable for which there is no meaningful ordering, ranking, of the categories.

Ratio Variable

A quantitative variable such that ratios of its values are meaningful and for which there is an inherently defined zero value.

Inherently defined zero value

A ratio variable has the following characteristic:

True

A runs plot is a form of scatter plot. True or False

False

A scatter plot can be used to identify outliers. True or False

Process

A sequence of operations that takes inputs and turns them into outputs is a ____________.

Population

A set of all elements we wish to study is called a ____________.

Experimental Study

A statistical study in which the analyst is abele to set or manipulate the values of the factors.

Observational Study

A statistical study in which the analyst is not able to control the values of the factors.

Quantitative (categorical) Variable

A variable having values that are number representing quantities.

Qualitative (categorical) Variable

A variable having values that indicate into which of several categories a population element belongs.

Ogive plot

A(n) ______ is a graph of a cumulative distribution.

Nominative

A(n) _____________ variable is a qualitative variable such that there is no meaningful ordering or ranking of the categories.

Histogram

All of the following are used to describe qualitative data except the ___________.

Stretching the axes

An example of manipulating a graphical display to distort reality is ___________.

Ordinal

An identification of police officers by rank would represent a(n) ____________ level of measurement.

Variable

Any characteristic of a population unit is a(n):

Variable

Any characteristic of an element is called a ____________.

Interval

College entrance exam scores, such as SAT scores, are an example of a(n) _____________ variable.

Set

Data collected for a particular study are referred to as a data ____________.

Primary data

Data that are collected by an individual through personally planned experimentation or observation are _____________.

Census

Examining all population measurements is called a _____________.

Data Set

Facts and figures, taken together, that are collected for statistical study.

8

If there are 130 values in a data set, how many classes should be created for a frequency histogram? Formula: 2k<N A. 4 B. 5 C. 6 D. 7 E. 8

6

If there are 62 values in a data set, how many classes should be created for a frequency histogram? Formula: 2k<N A. 4 B. 5 C. 6 D. 7 E. 8

False

If we examine some of the population measurements, we are conducting a census of the population. True or False

False

In a data set of information on college business students, an example of an element is their cumulative GPA. True or False

Nominative

Jersey numbers of soccer players is an example of a(n) ___________ variable.

Observations

Measurements from a population are called:

False

Selecting many different samples and running many different tests can eventually produce a result that makes a desired conclusion be true. True or False

Inference

Statistical ____________ refers to using a sample of measurements and making generalizations about the important aspects of a population.

True

Statistical inference is the science of using a sample of measurements to make generalizations about the important aspects of a population of measurements. True or False

Interval

Temperature (in degrees Fahrenheit) is an example of a(n) __________ variable.

Bar chart

The general term for a graphical display of categorical data made up of vertical or horizontal bars is called a(n) ___________.

True

The median is the value below which and above which approximately 50 percent of the measurements lie. True or False

Ratio

The number of miles a truck is driven before it is overhauled is an example of a(n) _____________ variable.

Relative frequency

The percentage of measurements in a class is called the ___________ of that class.

Measurement

The process of assigning a value of a variable to each element in a data set is called ___________.

Descriptive Statistics

The science of describing the important aspects of a set of measurements.

False

The science of describing the important aspects of a set of measures is called statistical inference. True or False

Interval and ratio

The two types of quantitative variables are:

Ratio

The weight of a chemical compound used in an experiment that is obtained using a well-adjusted scale represents a(n) _____________ level of measurement.

True

Using a nonrandom sample procedure in order to support a desired conclusion is an example of an unethical statistical procedure. True or False

Bar chart

Which of the following graphs is for qualitative data?

Using graphs to make statistical inferences

Which of the following is NOT an example of unethical statistical practices?

Mileage of a car

Which of the following is a quantitative variable?

Median

Which of the following is influenced the least by the occurrence of extreme values in a sample?

Cross-tabulation tables

________ can be used to study the relationship between two variables.

Descriptive statistics

___________ refers to describing the important aspects of a set of measurements.

Bar charts, pie charts

______________ and _____________ are used to describe qualitative (categorical) data.

Statistical inference

______________ is the science of using a sample to make generalizations about the important aspects of a population.