1. 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

2. 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

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

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

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

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

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

8. 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!

9. 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

10. 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

11. 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

13. 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?

15. 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

16. 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

17. 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?