BUS 245
When constructing a graph, which of the following statements is most accurate?
the simplest graph should be used for a given set of data
quantitative
A variable that assumes meaningful numerical values is called a _______ variable.
10
Assume that a professor gives an exam to a class of 50 students. The high score is 98 points and the low score is 48 points. TH professor wants to create a frequency distribution that is divided into five classes for the exam scores. The class width for the data is approximately _____ points.
designate males as 0 and females as 1 to compare gender performance on an aptitude test
From the scenarios below, indicate the one that best reflects the nominal scale.
observe individual data points
Histograms can be used for all of the following except to
an ogive is a graph of a cumulative (relative) frequency distribution, while a polygon is a graph of a (relative) frequency distribution
How does an ogive differ from a polygon?
graph that connects the midpoints of each class and its associated frequency or relative frequency
In descriptive statistics, a polygon is best described as
graph that connects the midpoints of each class and its associated frequency or relative frequency
In descriptive statistics, a polygon is best described as a
obtaining data from the population is often an expensive process
In general, we use sample data because
largest value- smallest value over number of classes
In order to approximate the class width for a frequency distribution of quantitative data, we calculate
frequency distribution
In order to summarize qualitative data, a useful tool is a
the sum of observations in the first, second, and third classes
Ina given cumulative frequency distribution, the "cumulative frequency" column value for the third class represents
pie chart
One method of graphical presentation for qualitative data is a
accurately depicts the data as a whole
One of the primary goals when constructing a frequency distribution for quantitative data is to summarize the data in a manner that
1. Calculate the arthmetic mean for the data set 2. Find the absolute difference between each value and the mean 3. Sum the absolute differences 4. Divide by the sample (or the population) size
Place in order the steps to calculate the mean absolute deviation.
ordinal
Qualitative data that can be categorized and ranked are measured on the ___________ scale.
make interferences about population parameters
Samples are primarily used to
a teacher should be able to determine the score for each student and to average of the most recent test scores
Sampling is necessary when it is either impractical or impossible to survey the entire population. In which situation does surveying the entire population instead of sampling just a part of the time population make the most sense?
saving money and time
Sampling, rather than surveying an entire population, can offer some substantial benefits. Some of those benefits include
to make informed decisions based on data
Statistics is used
8
Suppose the values in a data set are 2, 5, 5, 7, and 10. The range is
inferential
The branch of statistics that draws conclusions about a large set of data based on a smaller set of data is often referred to as _____ statistics.
descriptive
The branch of statistics that summarizes important aspects of a data set is often referred to as _______ statistics.
population mean
The notation μ represents the
categories
To construct a frequency distribution for qualitative data, the data are split into
quantitative class limits on the horizontal axis; frequency or relative frequency on the vertical axis
When constructing a histogram, what value/labels go on the horizontal (x) axis and the vertical (y) axis?
it groups data into categories, and records the number of observations in each category
Which of the following best describes a frequency distribution for qualitative data?
histogram
Which of the following graphical depictions is useful for observing the spread of the data for a single variable?
results of market research testing current consumer preferences for soda drinks
Which of the following is an example of cross-sectional data?
calculate the percent of 2500 U.S. voters in an opinion poll who approve of the president's performance
Which of the following is an example of descriptive statistics?
the outside temperature (in degrees Fahrenheit)
Which of the following scenarios is an example of the interval scale?
Categorize the data
With nominal data,you can
proportion of observations that occur in each class
A relative frequency distribution for quantitative data identifies the
pie chart
A __________ is a segmented circle whose segments portray the relative frequencies of the categories of some qualitative variable
population
A ____________ includes all items of interest in a statistical problem.
variable
A characteristic of interest that differs among various observations is referred to as a
time series data
A company wants to estimate the mean price of oil over the past 10 years. What type of data does the company need?
144
A new dining plan was implemented in a residence hall at State University. Residents were asked to assess the new plan and give a good grade of A, B, C, D, or F to the new dining plan. Of 480 residents, 234 gave a grade of B, 85 a grade of C, 13 a grade of D, and 4 a grade of F. The number of A grades is
360
A pie chart is a segmented circle whose segments add up to ________ degrees.