Recall that variables represent changing values. in this unit, you will work with equations that contain two different variables. what types of situations might be modeled with equations containing two or more variables? if the value of one variable changes, must the value of the other variable change for the equation to remain true? how would the number of solutions for an equation with two variables differ from the number of solutions for an equation with only one? explain.

Unaware that 35% of the 10000 voters in his constituency support him, a politician decides to estimate his political strength. a sample of 200 voters shows that 40% support him. a. what is the population? b. what is the parameter of interest? state its value c. what is the statistics of the interest? state its value d. compare your answers in (b) and (c) is it surprising they are different? if the politician were to sample another 200 voters, which of the two numbers would most likely change? explain