Unit 1, Ch 1

Question 1

Frequency

Answer 1

num of times a variable occurs
Ex. 3 people like math, 3 people like English

Question 2

Proportion

Answer 2

percent of frequency out of 1
Ex. 0.5 like math, 0.5 like English

Question 3

2 traits to watch out for in a chart (y, pic)

Answer 3

• how the y axis is labeled
• using pictures instead of bars

Question 4

Things to ALWAYS put on charts (3)

Answer 4

• Title
• Variable labels
• Percents/quantities

Question 5

Pie Chart

Answer 5

part of a whole

Question 6

Frequency Bar Chart

Answer 6

• Categorical Data (its frequency)

Question 7

Segmented Bar Chart

Answer 7

• Categorical Data
• 2 variable
• compare proportions between categorical variables

Question 8

Histogram

Answer 8

• Quantitative Data

Question 9

1 Category Displays

Answer 9

• pie chart
• relative bar chart
• frequency bar chart

Question 10

2 Category Displays

Answer 10

• segmented bar
• mosaic plot
• side-by-side barchart

Question 11

Two Way Table
- Marginal proportion
- Joint proportion (intersection)
- Conditional proportion (union)

Answer 11

• Total of 1 var and total
• 1 var cell and 2 var cell intersect (AND)
• 1 cell based on another var

Question 12

Categorical variable

Answer 12

descriptive (words)
Ex. what school do you go to

Question 13

Quantitative variable

Answer 13

uses numbers
Ex. how many A’s do you have

Question 14

How to describe misleading graph?
(2 steps)

Answer 14

1. what’s misleading?
2. in the context of the problem

Question 15

What is this question about:
“Does knowing the value of 1 var help predict the value of another var?”

Answer 15

Whether there’s an association btwn variables or not
Association or not?
Use 1 var to predict another
Example
- association = conditional rel frequency of 1 var is different from another

Question 16

SOCS

Answer 16

Describing a graph
Shape
Outlier
Center
Spread

Question 17

Centers (+ when to use)

Answer 17

Median - skewed (resistant)
Mean - symmetrical (non-resistant)

Question 18

Quantitative
discrete

Answer 18

countable - whole num

Question 19

Quantitative
continuous

Answer 19

measurement - decimals

Question 20

Stemplot

Answer 20

stem + leaves
- can use 2 variables - remember one would be mirrored
- key examples: 4|5 = 45 (objects), 0|5 = 0.5 inches

Question 21

Histogram ON CALCULATOR

Answer 21

1. Make list (list > edit)
2. 2nd + stat plot (y =)
3. Choose plot (right list, freq 1)
4. Zoom > 9 (Stat)
5. Trace

Question 22

Location of Median (formula)

Answer 22

(n+1)/2

Question 23

5 Number Summary

Answer 23

1. Minimum
2. Q1
3. Median
4. Q2
5. Maximum

Question 24

In short responses, ALWAYS explain how trait affects the context of the graph/problem!!!!

Answer 24

please

Question 25

Empirical Rule

Answer 25

68 - 95 - 99.7

Question 26

Relationshp btwn Variance and SD

Answer 26

Variance = SD^2