Chapter 2 Stats

What are the boundaries of the class 1.87-3.43

1.875-3.435

What are the boundaries of the class 11-18?

10.5-18.5

What is the lower class limit of the class 13-17?

13

If a frequency distribution had a class boundaries of 132.5-147.5, what would be the class width ?

15

What is the midpoint of the class 17-20?

18.5

For the class 5-19,the upper class limit is _____?

19

What is the upper class boundary of the class 23-25?

35.5

What is the lower class limit in the class 8-12?

7.5

What is the midpoint of the class 6-10?

8

Which of the following pairs of class limits would be appropriate for grouping the number 11,14,9,16

9-12 and 13-16

A Pareto chart does not have which of the following properties A)quantitative variable on the horizontal axis B) classes of data or categorical C) frequencies range range from highest to lowest D) frequencies displayed by the heights of vertical bars?

A) quantitative variable on the horizontal axis

A time series graph is useful for which of the following purposes A)representing the changing frequencies of a data category over a period of time B)representing the cumulative frequency of the data at specific time C)representing the frequencies of the data sorted from largest to smallest D) representing relative frequencies of categories at specific time

A) representing the changing frequencies of a data category over a period of time

Find the class boundaries,midpoint, and width of the class 15.2-18.1?

Boundaries= 15.5-18.5 MP=16.65 W=3

Find the class boundaries, midpoint, and width of the class 28-34?

Boundaries= 27.5-34.5 MP= 31 W=7

which of the following does not need to be done when constructing a frequency distribution? A)use classes that are mutually exclusive B)select the number of classes desired C)make the class width an even number D)find the range

C) make the class width an even number

A pie chart is not useful in showing which of the following characteristics of a data set A)categories that make up the smallest proportions of the total B) relative frequencies for each category in the distribution C)categories that make up the largest proportions of the total D) frequency changes overtime

D) frequency changes overtime

A Pareto Chart is useful for showing percentages of the total at different times. True or False ?

False

A histogram is a graph that represents the cumulative frequencies for the classes in a frequency distribution. True or False

False

A pie graph would best represent the number of inches of rain that has fallen in Ohio each day for the past two months True if False ?

False

For a given data set, the ogive and the frequency polygon will have the same overall shape. True or False

False

Which graph should be used to represent the frequencies with which certain courses are taken at Highlands middle school?

Pareto chart

A Pareto chart arranges data from largest or smallest according to frequencies. True or False ?

True

A Time series graph represents data that occurs over a specific time period. True or False ?

True

A stem and leaf plot has the advantage of a grouped frequency distribution over retaining the actual data while still showing them in graphical form. True or False ?

True

A time series graph is useful for detecting trend that occur over the period of time True or False ?

True

An ogive is also called a cumulative frequency graph. True or False?

True

If the limits for a class were 20-38, the boundaries would be 19.5-38.5 True or False?

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 or False?

True

The frequency polygon and the histogram are two different way to represent the same data set? True or False

True

The frequency polygon is a graph that's displays the data by using lines that connect points plotted for the frequencies at the midpoints of the classes. True or False ?

True

graphs give a visual representation that may enable readers to analyze and interpret data more easily than simply looking at tables of numbers. True or False ?

True

when two sets of data collected over specific periods of time are compared on the same graph using two lines, it's called a compound time series graph. True or False ?

True

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?

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 _____?

categorical frequency distribution

The________ of a specific class is the number of data values contained in it?

frequency

The three most commonly used graphs in research are the histogram,ogive,and _______?

frequency polygon

When the range is large and classes that are several units in width are needed, a __________ frequency distribution is used.

grouped

Which type of graph represents the data by using vertical bars of various heights to indicate frequencies?

histogram

When making Pareto Charts, data should be arranged _______according to frequency?

largest to smallest

for grouped frequency distributions the __________ is obtained by adding the lower and upper limits and dividing by 2

midpoint

The percentages of white, wheat, and rye brand sold at a supermarket each week is best shown using a _______graph ?

pie

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 graphs

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

A ______ graph would most appropriately represent the number of students that were enrolled in Statistics for each of the past 10 years?

time series

A weatherman records the amount of rain that fell in Portland, Oregon each day for a year. What type of graphs should he use to show how rainfall changes during the year?

time series graph

The lower class limit represents the smallest data value that can be included in the class...true or false?

true