AP Statistics
1.1 Displaying Distribution with Graphs
Objectives: Describe what is meant by explanatory data analysis
Explain what is meant by the distribution of a variable
Differentiate between categorical variables and quantitative variables
Construct a bar graph and pie charts for a set of categorical data
Construct a stemplot for a set of quantitative data
Construct a back-to-back stemplot to compare two related distributions
Construct a stemplot using spit stems
Activity 1A – pg. 38
1.
2.
3.
Explanatory Data Analysis:
Distribution of a Variable:
Construction graphs for Categorical Variables:
Pie Chart & Bar Graph
A group of 120 children were asked to name their
favorite flavor of ice cream. The results are shown
opposite.
Place this data into a pie chart and bar graph
Roundoff Error:
Quantitative Variables:
Stemplot:
To make a stemplot:
1.
2.
3.
Create a stem plot for the following data:
13, 28, 53, 49, 28, 49, 66, 50,
18, 27, 68, 45, 53, 21, 17, 55
Cluster:
Back-to-back stemplot:
Create a Back-to-back stemplot for the following sets of data:
Battery life (in hours) comparison:
Phone A: 7, 10, 15, 15, 17, 17, 19, 20, 22, 22, 26, 27, 30, 34, 36, 38, 56, 75
Phone B: 5, 7, 8, 8, 10, 11, 14, 17, 19, 21, 22, 22, 22, 30, 32, 34, 36, 38, 61
Splitting Stems:
Trimming:
HW: pg 46-48; 1.1(a,b) – 1.5