HW: Finish Samples Packet Tuesday, 5/2/17 Write the IC and HW in your planner. IC: Ch. 10 – day 1:Samples HW: Finish Samples Packet Materials Pencil, Marker, eraser Math Folder Classic box prediction worksheet 1

Bellwork Find the mean, median, mode, and range of the following data values: 13, 12, 8, 14, 11, 9, 8, 5 (Most) Mean = Median = Mode = Range = 8 5, 8, 8, 9, 11, 12, 13, 14 14 – 5 20  2 9 10

Grading Gold 1: Our Class Lays Lays sour cream Lays BBQ Cheetos Doritos Doritos cool ranch Fritos Prediction: _____ _____

Grading Gold 2: Our Class Lays Lays sour cream Lays BBQ Cheetos Doritos Doritos cool ranch Fritos Prediction: _____ _____

Grading Gold 3: Our Class Lays Lays sour cream Lays BBQ Cheetos Doritos Doritos cool ranch Fritos Prediction: _____ _____

Grading Gold 4: Our Class Lays Lays sour cream Lays BBQ Cheetos Doritos Doritos cool ranch Fritos Prediction: _____ _____

Yesterday’s survey didn’t get us the right number of bags for each type of chip. Why was that? The sample matters!

Good sample vs. Bad sample Good samples are… representative of the whole population can be used to predict future events valid not biased random Objective: By the end of the period, TSWBAT identify “good” samples using the vocabulary listed here!

Directions: We’re going to see what you might already know about samples. You and your elbow partner need two slates. On one slate write, “Good sample” and on the other write, “Bad sample.” Good sample Bad sample

Directions: Cut the problems apart and place each problem under one of the two categories. We haven’t learned this yet, but try to make the best educated guess you can. You can edit your work as we go through the lesson! Good sample Bad sample

Chapter 10 (7.sp.1&2) Using Sampling to Infer Date:_________ A student in Mrs. Thompson’s class conducted a random survey of all of Mrs. Thompson’s students to put some information about FWJHS to put in the yearbook. The following chart gives the results: A student in Mrs. Thompson’s class conducted a random survey of students during both lunches and surveyed every 25th student that walked through the door to get information about FWJHS to put in the yearbook. The following chart gives the results: Favorite Subject Number Math 20 Science 16 Social Studies 9 Media Arts 5 Art 4 PE 6 Favorite Subject Number Math 18 Science Social Studies 12 Media Arts 2 Art 5 PE

What percent of the students chose the correct favorite subject? What are some inferences that you can make about FWJHS based on these survey results: _____________________________________________________________________________ Favorite Subject Number Math 18 Science Social Studies 12 Media Arts 2 Art 5 PE What percent of the students chose the correct favorite subject?

Favorite Flavor of Popcorn Favorite Flavor of Popcorn A fundraising company came to school and got a list of 40 students randomly chosen by the computer. The representative talked to each student about their favorite flavor. The following chart gives the results: A fundraising company wants to know what flavors of popcorn would sell best at FWJHS. The company mailed a survey to every student at the Jr. High. Forty of the students returned the survey. The following chart gives the results: Favorite Flavor of Popcorn Number Butter 23 Cheese 4 Caramel 3 Cinnamon 1 Chili Salted 6 Favorite Flavor of Popcorn Number Butter 7 Cheese 18 Caramel 10 Cinnamon Chili Salted 5

Random Not Random Why? ____________________ __________________________ __________________________ Biased Unbiased Why? ____________________ Valid Not Valid Representative Yes No Random Not Random Why? ____________________ __________________________ __________________________ Biased Unbiased Why? ____________________ Valid Not Valid Representative Yes No

Favorite Flavor of Popcorn What are some inferences that you can make about FWJHS based on these survey results: _____________________________________________________________________________ Favorite Flavor of Popcorn Number Butter 23 Cheese 4 Caramel 3 Cinnamon 1 Chili Salted 6 What percent of the students chose the correct flavor which is cheese?