Keystone Workshop
Unit 7 Day 2-3: Predictions from Data and Representations of Data
Warm-up
Solve the system.
𝑥 − 4𝑦 = 9
{
2𝑥 + 3𝑦 = −4
Keystone Workshop
Unit 7 Day 2: Predictions from Data
Warm-up
Solve the system.
𝑥 − 4𝑦 = 9
{
2𝑥 + 3𝑦 = −4
Keystone Workshop
Unit 7 Day 2: Predictions from Data
Warm-up
Solve the system.
𝑥 − 4𝑦 = 9
{
2𝑥 + 3𝑦 = −4
Keystone Workshop
Unit 7 Day 2: Predictions from Data and Representations of Data
Goal: Estimate or calculate to make predictions based on circle, line, or bar graph,
measures of central tendency, or other representations
I. Predictions Based on Trends

___________________________________________ found from data are often used
to predict outcomes of larger populations or future events.
Example 1:
II. Predictions Based on Probability

Predictions can be made on populations of data by finding probabilities of events
occurring in samples.
Ex. The graph below shows the responses of 50 people to a survey question. If the same
survey is conducted using 600 responses, predict how many people would be undecided.
Example 2:
III. Box-and-Whisker Plots





The ___________________________ is the left-most whisker
The _____________________________is the left edge of the box
The ________________________________________ is the middle of the box
The _____________________________ is the right edge of the box
The ____________________________ is the right-most whisker
Example 3:
Example 4:
IV. Stem-and-Leaf Plots


Left digit of all data values are lined up in the __________ of the plot
The right digit of each data value is placed in the corresponding ___________
o Ex. The ages of cast members in a play are 19, 35, 16, 24, 22, 37, 60, 34, 57,
and 19. Make a stem and leaf plot.
Example 5:
HW: Pages 181-183 AND 188-190