SOCI301 Lecture Notes - Lecture 9: Central Limit Theorem, Anheuser-Busch Brands, Statistical Parameter
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Inferential-use data from sample to make an informed guess. Stand dev of height of students in the room-sample stat. In the schlitz vs michelob example of all michelob drinkers (population) A cnn poll conducts a poll among 248 registered voters who describe themselves as republicans on march 17-20. Ex: draw a random sample of 50 college students, record if theyre sociology majors or not. What does the distribution of these 50 observations look like?- only 2 students sociology majors in a frequency graph. Ex: sample of 10,000 students of avg gpa, 5 random samples total, frequency shows results of a random sample of n=10 college students. If n is sufficiently large, then the sample means from many random samples from a population with mean and variance are approximately a normal distribution with mean and variance regardless of the distribution of the original variable.