Difference between revisions of "AP Statistics Curriculum 2007 EDA Freq"

Revision as of 15:15, 27 January 2008

There are two ways to describe a data set (sample from a population) - Pictorial Graphs or Tables of Numbers. Both are important for analyzing data.

A frequency distribution is a display of the number (frequency) of occurrences of each value in a data set.
A relative frequency distribution is a display of the percent (ratio or frequency to sample-size) of occurrences of each value in a data set.

Stage of disease at diagnosis of breast cancer in a random sample of US women.

Computer simulations and real observed data.

Step-by-step practice problems.

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 ===Summarizing data with Frequency Tables & Histograms===
-Example on how to attach images to Wiki documents in included below (this needs to be replaced by an appropriate figure for this section)!
+There are two ways to describe a data set (sample from a population) - Pictorial Graphs or Tables of Numbers. Both are important for analyzing data.
 <center>[[Image:AP_Statistics_Curriculum_2007_IntroVar_Dinov_061407_Fig1.png|500px]]</center>
-===Approach===
+===Definitions===
-Models & strategies for solving the problem, data understanding & inference.
+* A '''frequency distribution''' is a display of the number (frequency) of occurrences of each value in a data set.
+* A '''relative frequency''' distribution is a display of the percent (ratio or frequency to sample-size) of occurrences of each value in a data set.
-* TBD
-===Model Validation===
+===Example===
-Checking/affirming underlying assumptions.
+Stage of disease at diagnosis of breast cancer in a random sample of US women.
-* TBD
+{| class="wikitable"
+|-
+! Stage
+! Frequency
+! Relative Frequency
+|-
+| 0
+| 197
+| 0.09
+|-
+| I
+| 691
+| 0.33
+|-
+| II
+| 703
+| 0.34
+|-
+| III
+| 314
+| 0.15
+|-
+| IV
+| 187
+| 0.09
+|-
+| Total
+| 2092
+| 1.00
+|}
 ===Computational Resources: Internet-based SOCR Tools===