DE Stats - Chapter 2
Pareto Chart
which graph should be used to represent the frequencies with which certain courses are taken at Highlands Middle school?
make the class width an even number
which of the following does not need to be done when constructing a frequency distribution?
3-6 and 7-10
which of the following pairs of class limits would be appropriate for grouping the numbers 5, 8, 3, and 10?
13
how many students memorized the number in three trials or less?
9
if a frequency distribution had class limits of 132-140, what would be the class width?
right skewed
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?
17.5-18.5 years old
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?
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
0.191
the following frequency distribution presents the frequency of passenger vehicles that pass through a certain intersection from 8:00 am t 9:00 am on a particular day. what is the relative frequency of the truck category?
about 2.1 percentage points
the following time series plot represents the population growth of a suburb of Atlanta Georgia for each of the years 1990-2009. estimate the amount by which the rate of growth changed from 1993-1995
6.0%
the following time series plot represents the population growth of a suburb of Atlanta Georgia for each of the years 1990-2009. estimate the rate of growth in 2007
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
pie
the percentages of white, wheat, and rye bread sold at a supermarket each week is best shown using a what?
frequency polygon
the three most commonly used graphs in research are the histogram. the what, and the cumulative frequency graph (ogive)?
frequency
the what of a specific class is the number of data values contained in it?
categorical frequency distribution
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?
30
using the ogive shown below, what is the cumulative frequency of data values less than or equal to 16?
11.5 and 18.5
what are the boundaries of the class 12-18?
13
what is the lower class limit of the class 13-17?
12
what is the midpoint of the class 10-14?
raw data
when data are collected in original form, they are called?
from largest to smallest
when making Pareto charts, data should be arranged how according to frequency?
grouped
when the range is large, and classes that are several units in width are needed, a what frequency distribution is used?
categorical
Greg wants to construct a frequency distribution for the political affiliation of the employees at Owens Hardware Store. what type of distribution would be best?
a
a pareto chart does not have which of the following properties? a) quantitative variable on the horizontal axis b) frequencies arranged from the highest to lowest c) frequencies displayed by the heights of vertical bars d) classes of data are categorical
false
a pareto chart is useful for showing percentages of the total at different times
c) frequencies change over time
a pie graph that is not useful in showing which of the following characteristics of a data set?
false
a pie graph would best represent the number of inches of rain that has fallen in Ohio each day for the past 2 months
true
a time series graph is useful for detecting trends that occur over the period of time
b) representing the changing frequencies of a data category over a period time
a time series graph is useful for which of the following purposes?
true
a time series graph represents data that occur over a specific time period
time series graph
a weatherman records the amount of rain that fell in Portland, Oregon each day for a year. what type of graph should he use to show how rainfall changes during the year?
time series
a what graph would most appropriately represent the number of students that were enrolled in statistics for each of the past 10 years?
true
an ogive is also called a cumulative frequency graph
skewed to the right
classify the histogram as skewed to the left, skewed to the right, or approximately symmetric?
false
for a given data set, the ogive and the frequency polygon will have the same overall shape
23
for the class 5-23, the upper class limit is?
true
graphs give a visual representation that may enable readers to analyze and interpret data more easily than simply looking at tables of numbers
relative frequency graphs
graphs that show distributions using proportions instead of raw data as frequencies are called?
