Reading Assignment for Next Class: Sullivan 3.1

Homework due 1/26/2017

Reading assignment for next class: Sullivan 3.1

Introduction to Statistics Online Edition (free textbook on vf-tropi.com)p.124-133

or your own book, the chapter on “Measures of Central Tendency” or “Averages”

Poverty

Every year the US Census Bureau counts the number of people living in poverty in the US. The Bureau uses monetary income thresholds to define poverty, so noncash benefits such as Medicaid and food stamps do not count toward poverty thresholds. For example, in 2009 the poverty threshold for a family of four with two children was $21,756. The bar graph represents the number of people living in poverty in the US in 2009 by ethnicity.

1) How many whites

were living in poverty

in 2009?

2) Of the impoverished,

what percentage

were Hispanic?

3) How might this graph

be misleading?

“Given a choice of the following, which one would you most want to be?”

The results of this survey are shown in the side-by-side bar graph

4) What proportion of males

would like to be richer?

5) Which attribute do females

desire more than males?

6) Which described attribute

do males and females

desire equally?

7) What was the most

frequent outcome?

8) What was the least

frequent?

9) How many times was a

“7” observed?

Sale price (in thousand $) / Frequency
8.0 – 11.0 / 2
11.1 - 14.1 / 5
14.2 – 17.2 / 7
17.3 – 20.3 / 10
20.4 – 23.4 / 3
23.5 – 26.5 / 1

10) The frequency distribution below summarizes

the sale prices for cars sold in Portales in

January.

Determine the midpoint for class 23.5 – 26.5.

a) 24.5 b) 24.9

c) 25.1 d) 25

Years of experience / Frequency
1 - 2 / 9
3 - 4 / 20
5 - 6 / 15
7 - 8 / 12
9 - 10 / 10
11+ / 9

11) The frequency distribution summarizes the years of

experience for teachers at Mayfield High School.

Find the class boundaries for class 9 – 10.

a) 8.5 – 9.5 b) 9 – 10

c) 8.5 – 10.49d) 9.5 – 10.5

12) For the frequency distribution below, find the midpoint for class 9 – 10

Category Frequency

1 – 2 7

3 – 4 14

5 – 619

7 – 8 23

9 – 10 34

11 – 12 76

a) 9.5b) 9.8c) 10d) 9

13) For the frequency distribution below, find the class boundaries for class 9 – 10