1. Homework: pg. 19 #7-12, skip 11
7.) A.
Consumers seem to prefer lighter colors to darker colors. The percent of the other colors is 14.2
8.)
B. White was the most popular for these two types of cars. The medium/dark colors were much less popular, except medium/dark gray was a popular choice for luxury.

2. 9.) A.
10.)
A .
B. The dotplot is centered around 2 with a long tail. Only two of the 34 differentials are negative. The team scored at least as many goals as their opponents in 32 of 34 games
B. Yes. It makes sense that the distribution is skewed to the right. Most countries win no medals or very few medals and a few countries win a lot of medals.
12.) Categorical: a,c,d
Quantitative: b,e,f

3. Displaying Distributions with Graphs
Section 1.1

4. Vocabulary—types of graphs
distribution—tells us what value the variable takes and how often it takes it
categorical variables—bar graphs & pie charts
*Places individuals in groups
quantitative variables—dot plots stemplots, histograms, boxplots
Takes numerical values

5. Stemplot stem—all digits except the last Leaf—last digit
Also known as a Stem-and-Leaf Plot
Gives a quick picture of the shape of the distribution
stem—all digits except the last
Leaf—last digit
Key:_________

6. Make a stemplot Wayne Gretsky: Goals per season 51 87 40 31 70 55 7351 87 40 31 70 55 73 54 16 3 92 52 38 43 71 62 41 11 15 8 23 25 9

7. Make a stemplot:
Heart rate for 15 seconds.. Come to board and write how many beats.

8. Back to Back Stemplots
Can have 2 sets of data with the same stems and different leaves—work from the inside out 1 5 2 8 3 6 7 4 9

9. More stemplots If the # are really big you can round in the stemplot
Remember—purpose of stemplot is to show distribution of data
Can also split the stem if there are a lot of numbers 1 2
0-4
5-9

10. Does the DH in baseball affect the number of runs?
National League
RUNS
Diamondbacks
720
Braves
753
Cubs
855
Reds
704
Rockies
747
Marlins
770
Astros
712
Dodgers
700
Brewers
750
Mets
799
Phillies
Pirates
735
Padres
637
Giants
640
Cardinals
779
Nationals
641
*Data from 2008
American League
RUNS
Orioles
782
Red Sox
845
White Sox
811
Indians
805
Royals
691
Angels
765
Twins
829
Yankees
789
Athletics
646
Mariners
671
Rays
774
Rangers
901
Blue Jays
714
Tigers
821
Does the DH in baseball affect the number of runs?

11. Shape of distributions
Skewed Right
Symmetric
Skewed Left

12. Describing distributions
4 things you name when describing the distribution:
1. given center (mean, median)
2. give spread (low-high, range, standard deviation, or quartiles)
3. shape (symmetric, skewed)
4. outliers (falls outside the “norm”)

13. Describe the distributions:
Wayne Gretzky Data:
American League Runs:
National League Runs:

14. HW 1.1: pg 46 #3-6
MULTIPLIER