Wednesday, April 27, 2016 Make sure you have your pencil and math journal out. If you have questions on your homework, please keep it on your desk. *Talk.

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Wednesday, April 27, 2016 *Make sure you have your pencil and math journal out. *If you have questions on your homework, please keep it on your desk. *Talk with your group….Why would I put this comic up? How does it relate to statistics?

Warm – Up: Talk With Your Group Members Talk with your team members about calculating the surface area and volume of cylinders. Here are some questions to start your conversation: *How do you understand or think about the formulas? *Do you have any tricks to solving for them? *What problems have you had? How did you solve them?

Today’s Objective: I will be able to determine whether a sample is biased or unbiased, and therefore whether conclusions made are valid. *How does this connect to what you’ve already learned in statistics? Hint, hint: You’ve already compared distributions of data, models, and diagrams. How do you know if those models were biased or unbiased? What does biased mean?

Biased: Unfairly prejudiced for or against someone or something; Tending to yield one outcome more frequently than others in a statistical experiment. Why do we need to worry about bias in sample populations?

Whole-Group Discussion: SOUP If you want to know what a bowl of soup tastes like, do you need to eat all of the soup in the bowl? Or can you get a good idea of the taste by trying a small sample? When you conduct a survey, it is not usually possible for you to survey every person in the population you are interested in, such as all female teenage shoppers or all of the students at your school. Instead, statisticians collect information about a sample (a portion) of the population. However, finding a representative sample (a sample that represents the whole population well) is not easy.

In a poll of Ms. Hayes’ math class, 67% of the students say that math is their favorite academic subject. The editor of the school paper is in the class, and he wants to write an article for the paper saying that math is the most popular subject at the school. Explain why this is not a valid conclusion and suggest a way to gather better data to determine what subject is most popular.