Chapter 2 Introduction to Statistics

A table that shows classes or intervals of data entries with a count of the number of entries in each class. 

• Frequency distribution
• Frequency polygon
• Histogram
• Ogive

The __________ of a class is the sum of the lower and upper limits of the class divided by tow. 

• interval
• midpoint 
• relative frequency
• cumulative frequency

The __________  __________ of a class is the portion, or percentage of of the data that falls in that class. To find the relative frequency of a class, divide the frequency f by the sample size n. 

• Relative frequency
• Cumulative frequency 
• Frequency distribution
• Frequency table

In a frequency distribution, the class width is the distance between the lower and upper limits of a class. 

• True
• False

An ogive is a graph that displays relative frequencies. 

• True
• False

Which graphs displays a set of data. 

• Stem and leaf
• Dot plot
• Pie Chart 
• All of the above

Given the data set below.  What is the mode?
24  27  19  21  18  23  21  20  19  33  30  29

• 19
• 21
• 19, 21
• 23, 33

The ________ of a data set is the sum of the data entries divided by the number of entries.

• Mean
• Median
• Mode
• Range

You are taking a class in which your grade is determined from five sources: 50% from your test mean, 15% from your midterm, 20% from your final exam, 10% from computer lab work, and 5% from your homework. Your scores are 86 (test mean), 96 (midterm), 82 (final exam), 98 (computer lab), and 100 (homework).  What is the weighted mean?

• 90.2
• 89.7
• 88.6
• 87.87

Find the mode price of condominiums (in dollars per square foot) for a sample of condominium in Florida.
324  462  540  450  638  564  670  618  624 825  540  980  1650  1420  670  830  912  750  1260  450  975  670  1100 980  750  723  705  385  475  720

• 1650
• 980
• 975
• 670