1. Construct viable arguments and critique the reasoning of others. 2. Use appropriate tools strategically. 3. Represent proportional relationships by equations. 4. Convert a rational number to a decimal using long division; know that the decimal form of a rational number terminates in 0s or eventually repeats. 5. Understand that statistics can be used to gain information about a population by examining a sample of the population; generalizations about a population from a sample are valid only if the sample is representative of that population. Understand that random sampling tends to produce representative samples and support valid inferences. 6. Use measures of center and measures of variability for numerical data from random samples to draw informal comparative inferences about two populations.