AIM: How can we use random samples to make inferences about a population?
HW: Inferences from random samples wksht #9-12 (posted below and on Jupitergrades)
You want to find out which stores people shop at the most at the local mall. You go to a park and survey every 4th person you see.
Is this a bias or random sample? Explain.
Yesterday's work with random samples flows into today's lesson on inferences from random samples. We will be using the results from random samples to make predictions about a population. This concept is extremely important during election times when sample polls are used to make predictions about potential candidate victories.
We conducted an experiment in class to simulate this idea using a paper bag and colored tiles. Each bag had 25 tiles, some red and some different colors. Students were not allowed to look into the bag. They took a sample of 5 and counted how many of the 5 were red. They used this amount to predict how many were red in the bag and then compared their predictions to the actual amount.