Transcript Histograms Review

Statistics: Analyzing Quantitative
Data
Review of Histograms
Do Now:
1. Describe the histogram using SOCS
2. How many extra curricular activities do you
participate in?
1. Designate one person from your table
group to come to the board and document
each group member’s answer.
Overview
• Grades/Quiz
• Homework tonight: Journal
• Overview of this week
Homework from Friday
• Questions on just the part involving
histograms?
Histograms:
• What is the biggest difference between a
histogram and a bar graph?
Histograms:
• The bars are always touching
• Used to describe Quantitative Data
– Whereas Bar graphs are used to describe
Categorical Data
• When creating a histogram:
– I will never penalize you for what you choose as a
“bin width” (within reason)
– You need to have a title and label your axis.
Histogram of Extra Curricular Activities
• Let’s create it!
• First– what’s the context for this data?
–
–
–
–
–
–
Who?
What?
When?
Where?
Why?
How?
• What kind of variables do we have?
Create a histogram Example B:
• The Cornell Lab or Ornithology holds an annual
Christmas Bird Count, in which birdwatchers at various
locations around the country see how many different
species of birds they can spot. Here are some of the
counts reported from sites in Texas during the 1999
event.
178
206
156
186
177
153
162
175
153
206
167
152
166
162
228
a. Create a histogram of the data
b. Write a brief description of the data
163
160
183
160
181
157
Describing Histograms:
• SOCS:
– Shape: Modal + Symmetric vs. Skewed
– Outliers?
– Center
– Spread
Example One:
Follow Up:
• Would you expect the mean to be larger or
smaller than the median?
– Why?
Example Two:
Frequency
Temperature in the Bahamas over the course of a
year
Temperature
Follow Up Question
• In the last example, would you expect the
mean to be larger or smaller than the
median?
– Why?
Example Three:
• What’s wrong with this histogram?
Practice Problems
• Try some in your table groups!
Exit Ticket
Use SOCS to describe the histogram below