A researcher would like to compare the effectiveness of two different methods for teaching third-grade mathematics. One group of students is assigned to Dr. Tang's class using method I and another group is assigned to Dr. Washington's class using method II. At the end of the school year, each child is given a standardized mathematics achievement test and the two groups of scores are compared. What variable is confounded with the key variable of interest?

How can we find the measure of an exterior angle if we know the measurement of an interior angle

Rewrite the following quadratic functions in intercept or factored form. show your work. f(x) = 3x^2 - 12

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