Interpreting two-way tables

The topic of  is under the Probability and statistics Math Mission. This exercise explores and analyzes bivariate data using contingency tables and analysis of percentages.

Types of Problems
There are three types of problems in this exercise:


 * 1) Fill in chart and infer: This problem gives some raw data and a blank chart. The student is asked to fill in the chart with the correct percentages based on the numbers, and then answer a question about the data.Freqdata1.png
 * 2) Answer and infer: This problem describes a situation involving data. The student is asked to answer a particular question based on the information provided (words and/or charts) and then answer a summative question about the data.Freqdata2.png
 * 3) Analyze the situation: This problem uses words and charts to describe a situation. The student is asked to answer a question about the information in the problem.Freqdata3.png

Strategies
This exercise is medium to get accuracy badges because you have to be very careful with calculations and inference. The speed badges are hard because it takes a fair amount of time to read, analyze and answer.
 * 1) Differences of 1% are certainly not significant, whereas 10% are. The middle ground is really based on the size of the samples.
 * 2) Research awarded the first speed badge very easily, but did not continue to see if it was a fluke. If it is not, the speed badges might have a reasonable tolerance and could be upgraded to medium.