In Exercises 25 to 38, graph each equation by plotting points that satisfy the equation. y = x2 - 3

Lecture 5: Sampling Distributions: The primary question is whether we can believe the results of a random sample or a randomized comparative experiment. Is the element of chance affecting the data we collect Parameter: Is a number that describes the population. (It is usually not known.) Statistic: Is a number that describes a sample. A statistic often estimates an unknown parameter. Example We want to measure the mean amount spent purchasing houses in Oregon. This is the parameter. We interview 500 people who purchased houses and find the mean purchase price for this sample of house buyers. This is our statistic. How well does our statistic approximate our parameter Population Distribution: Of a variable is the distribution of values of th