Turn Homework into basket Warm-up # 4 Find the M.A.D of x x x x xxx x x x

Agenda Warm-up Homework Review Task Sampling Rectangles Revisit Vocabulary/ EQ TOD

Homework Review Five Number Summary

Task Complete Sampling Rectangle Task

Task Discussion –What are the benefits of a box plot? –What are the benefits of a dot plot? –Find the M.A.D of each sample.

Task Discussion Which graph do you think is the better predictor of the actual mean? Actual –Mean – 7.42

Vocabulary Voluntary sample-A voluntary response sample consists of people who chose themselves by responding to a general appeal. (Be Aware) They often over represent people with strong opinions, most often negative opinions. For example, if there was pre-election coverage taking place on TV and the screen provided a number a person could call to "vote" for or against a certain candidate being interviewed, the people watching would be able to choose whether or not they wanted to take part in the survey, and thus this would be a voluntary response sample.

Vocabulary Convenience sample- Is chooses the individuals that are easiest to reach or sampling that is done easy. Convenience sampling does not represent the entire population so it is considered bias Example-Interviewing people at a shopping mall as they walk by. This is easy because you just choose it, without any random mechanism. You just choose the people that walk by you as your standing there. Sometimes the people could ignore you so it all depends what your surveying.

Vocabulary Random sample-A selection that is chosen randomly (purely by chance, with no predictability) Example: if you wanted to take a random sample of water from a river, you could have a map of the river and choose a spot blindfolded then work out how to get there!

Vocabulary Representative sample- When conducting a study, a researcher selects a relatively small group of participants (a sample) from an entire population of all possible participants. Example, selecting college students at a couple of colleges from all college students in the world.

Vocabulary Sampling distribution-Is the spread of the sample. Random number generator

Ticket Out the Door #4 Find the five point summary of {6,12,14,15,18}