Day 2 Classify data and Make Histograms September 06,...

Day 2 Classify data and Make Histograms September 06, 2018

Reminder: You have until tomorrow to finish Parts 1 and 3 of Asssignment #1

Your homework grade will consist of two components:

A self reported HW Proficiency grade (using the rubric below) recorded on the other side of this sheet AND

a random homework quality grade given by Mr. Cedarlund.

How to evaluate and score your HW.

Homework recording sheet

Homework Proficiency Rubric

Classify data

Create and/or interpret Histograms

What, exactly, is a histogram ?

Today:

The size of the Interval is critical

Yearly crime reports for the last six years: 3, 6, 6, 2, 3 and 4 crimes a year, with class interval sizes of one year the bar graph looks this way:

we can see that the crime rate was going up for the last three years

if we choose class intervals of two years, the impression from the bar graph is that the crime rate was going down all the time:

smaller class interval sizes show more exact picture

On Assignment #1 , it is nice to be able to enter the data and quickly plot a histogram.

Guidelines for Drawing a Histogram- 5 to 10 classes

-Intevals go on x-axis

-Frequency always goes on y-axis

-No horizontal space between bars.

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