1. Homework: pg. 56 #8-12
8.) A. Skewed to the right, with a center around a 3. The smallest number of frost days is 0 and the largest number is 10. There are no gaps or outliers in this distribution. B. About 23% 9.) Shape: roughly symmetric; center: 12 hours; spread: from 7 AM and 5 PM 10.) skewed to the right with a center at about 4. The range is 11 letters.

2. 11. ) A. B. Symmetric with a center of about 55 years
11.) A. B. Symmetric with a center of about 55 years. The range is 27 years. C. The youngest was Teddy Roosevelt; the oldest is Ronald Reagan. D. He was among the younger presidents, but not an outlier.

3. 12. ) A. B. The distribution contains a large gap (from 2 to 38 grams)
12.) A. B. The distribution contains a large gap (from 2 to 38 grams). The sugar content is slightly skewed to the right.

4. Displaying Distributions with graphs- relative frequency and Cumulative frequency
Sections 1.1 day 3

5. Relative Frequency Histogram that shows percents instead of frequency
Good when you have multiple histograms to compare with different counts

8. Relative Cumulative Frequency Graph (Also called Ogive)
Decide on class widths. Make a relative frequency for each class. (count in each interval/ total count)
To make cumulative frequencies, add each frequency to the previous interval’s frequency.
Start at zero, plot each cumulative frequency as a ordered pair with left-hand endpoint of the next interval.
Continue until you reach 100%.

9. Example
Percent of College Students Enrolled in Public Institutions- by State

10. Can make frequency table to help..
CLASSES
FREQUENCY
CUMULATIVE FREQUENCY
RELATIVE FREQUENCY
CUMULATIVE RELATIVE FREQUENCY

12. Time Plots Plots the data in time order
time plot—plots each observation against the time at which it was measured
Time on horizontal axis
Variable measuring on vertical axis
Connect data points with lines helps emphasize any change

13. AP Problems!

16. Pg. 64 # AP Problems