DE Stats- Chapter 2
A time series graph represents data that occur over a specific time period.
True
An ogive is also called a cumulative frequency graph.
True
Graphs that give a visual representation that may enable readers to analyze and interpret data more easily than simply looking at tables of numbers.
True
The cumulative frequency for a class is the sum of the frequencies of the classes less than and equal to the upper boundary of the specific class
True
The frequency polygon and the histogram are two different ways to represent the same data set.
True
The frequency polygon is a graph that displays the data by using lines that connect points plotted for the frequencies at the midpoints of the classes.
True
When the range is large and classes that are several units in width are needed, a __________ frequency distribution is used.
grouped
Which of the following does not need to be done when constructing a frequency distribution?
make the class width an even number
Which of the following could be an ogive?
one where it starts from x-axis
The percentages of white, wheat, and rye bread sold at a supermarket each week is best shown using a _______ graph.
pie
A Pareto chart does not have which of the following properties?
quantitative variable on the horizontal axis
When data are collected in original form, they are called __________.
raw data
Graphs that show distributions using proportions instead of raw data as frequencies are called
relative frequency graph
A time series graph is useful for which of the following purposes?
representing the changing frequencies of a data category over a period of time
If the graph of a frequency distribution has a peak and the data tapers off more slowly to the right and more quickly to the left, the distribution is said to be ________________________.
right-skewed
Classify the histogram as skewed to the left, skewed to the right, or approximately symmetric.
skewed to the right
A ____________ graph would most appropriately represent the number of students that were enrolled in Statistics for each of the past ten years.
time series
A weatherman records the amount of rain that has fallen in Portland, Oregon during each day. What type of graph should he use?
time series graph
One hundred students are shown an eight-digit number on a piece of cardboard for three seconds and are asked to then recite the number from memory. The process is repeated until every student accurately recites the entire number from memory. The following histogram presents the number of trials it took each student to memorize the number. How many students memorized the number in three trials or less?
13
What was the lower class limit of the class 13-17?
13
The following frequency distribution presents the frequency of passenger vehicles that pass through a certain intersection from 8:00 AM to 9:00 AM on a particular day. Vehicle Type Frequency Motorcycle 8 Sedan 86 SUV 84 Truck 42 What is the relative frequency of the Trunk category?
0.191
What are the boundaries of the class 12-18?
11.5-18.5
What is the midpoint of the class 10-14?
12
In an ungrouped frequency distribution of the average age of high school graduates, what would be the boundaries for the class of graduates who were reported to be 18 years old?
17.5-18.5 years old
For the class 5 - 23, the upper class limit is
23
Which of the following pairs of class limits would be appropriate for grouping the numbers 5, 8, 3, and 10.
3-6 and 7-10
Using the ogive shown below, what is the cumulative frequency of data values less than or equal to 16?
30
The following time-series plot presents the population growth (in percent) of a suburb of Atlanta, Georgia for each of the years 1990 through 2009. Estimate the rate of growth in 2007.
6.0%
If a frequency distribution had class limits of 132-140, what would be the class width?
9
Give the degrees and percentage of each Cookie Type for a Pie Graph. Chocolate Chip- 20 Peanut Butter- 15 Oatmeal- 30 Sugar- 10
Degree / % 96 / 26.7% 72 / 20% 144 / 40% 48 / 13.3%
A Pareto chart is useful for showing percentages of the total at different times.
False
A pie graph would be represent the number of inches of rain that has fallen in Ohio each day for the past 2 months.
False
For a given data set, the ogive and the frequency polygon will have the same overall shape.
False
Which graph should be used to represent the frequencies with which certain courses are taken at Highlands Middle School?
Pareto chart
A time series graph is useful for detecting trends that occur over the period of time.
True
The following time-series plot presents the population growth (in percent) of a suburb of Atlanta, Georgia for each of the years 1990 through 2009. Estimate the amount by which the rate of growth changed from 1993 to 1995.
about 2.1 percentage points
Greg wants to construct a frequency distribution for the political affiliation of the employees at Owen's Hardware Store. What type of distribution should he use?
categorical
Thirty students recorded the colors of their eyes, choosing from the colors brown, blue, green, hazel, and black. This data can be appropriately summarized in a(n)
categorical frequency distribution
The __________ of a specific class is the number of data values contained in it
frequency
A pie graph is not useful in showing which of the following characteristics of a data set?
frequency changes over time
The three most commonly used graphs in research are the histogram, the _____________________________, and the cumulative frequency graph (ogive).
frequency polygon
When making Pareto charts, data should be arranged _______________________ according to frequency.
from largest to smallest