Warm Up

Self Assessment

1. Naoko and Pam compared the music on their MP3 players.

Rock Country

Naoko 522 315

Pam 118 145

What percentage of the collection is a country song and is on Pam’s MP3 player?

A. 0.15

B. 0.24

C. 0.42

D. 0.53

2. The table below shows the results of a survey conducted among the students of a school to find what activity they most like to do in their free time.

What is the marginal frequency of students who like to watch TV?

A. 40

B. 44

C. 84

D. 136

3. The table below shows the number of puzzles of each difficulty level in each of three crossword puzzle books.

Easy Medium Hard Challenge Totals Book #1 30 20 15 10 75 Book #2 25 25 25 25 100 Book #3 25 35 10 5 75

Totals 80 80 50 40 250

Of the challenge puzzles in these books, what fraction were in Book #2?

A.

B.

C.

D.

4. What does MAD measure?

A. Central Tendency

B. Spread of the data

C. How far outliers are from Q3 &Q1

D. Same thing as Mean

5. Tracey and Jason played 5 games on a handheld video game and recorded their scores in the table. Find the mean absolute deviation for their scores and identify which statement below is true when comparing their variability.

Game Tracey (avg. 20)

Jason(avg. 20)

Game 1 30 15

Game 2 20 25

Game 3 5 20

Game 4 25 25

Game 5 20 15

 

A. Tracey’s MAD is 26 and she has less variability.

B. Tracey’s MAD is 6 and she has more variability.

C. Jason’s MAD is 15.8 and he has less variability

D. Jason’s MAD is 4 and he has more variability.

6. What is the joint frequency of students who have chores and a curfew? Which marginal frequency is the largest?

Curfew: Yes Curfew: No Total

Chores: Yes 13 5 18

Chores: No 12 3 15

Total 25 8 33

A. Joint Frequency = 25

Marginal Frequency = 13

B. Joint Frequency = 13

Marginal Frequency = 5

C. Joint Frequency = 13

Marginal Frequency = 25

D. Joint Frequency = 8

Marginal Frequency = 25

7. The number of runs scored by the Stars for six games is shown below.

4, 8, 0, 4, 0, 6

If the Stars scored 13 runs in their seventh game and added this value to the data set, which statement would be true?

A. The mean and the median will both increase.

B. The median and the mean will both remain the same.

C. The median will increase and the mean will remain the same.

D. The mean will increase and the median will remain the same.