1. 8.3 Frequency Tables and Histograms

2. Frequency Table = Frequency Distribution
lots of numerical data(quantitative)
broken into 5 to 12 equal size categories(classes)
counted up with tally marks

3. Frequency Distribution guidelines
find the biggest value and the smallest value
get the range = biggest - smallest
calculate the width of each class
divide the range by something manageable to get an answer between 5 and 12
build a table using the width for your classes on the left side
tally it up to find your frequency

8. Model Class is the class with the most in it(highest frequency)

10. a bar graph for quantitative data the bars touch each other
Histogram
a bar graph for quantitative data
the bars touch each other
the x-axis is labeled using the midpoint of each class

11. Histogram guidelines
Do the frequency table for the data
Find the midpoint for each class
class high + class low 2
Mark the bars equal width on the x-axis and touch
Draw the bar as tall as its frequency

12. What’s the Difference between
Bar Graph
bars don’t touch
bars represents one item or type
can be qualitative or quantitative
Histogram
bars do touch
bars represents a range of values
can be quantitative only