General Statistics: Ch 2 Test

1.

**Construct the cumulative frequency distribution that
corresponds to the given frequency distribution.**

* 5 (+5)*

* 7 (5 + 2)*

* 12 (5 + 2 + 5)*

* 17 (5 + 2 + 5+ 5)*

* 30 (5 + 2 + 5 + 5 + 13)*

2.

**19** *(+19)*

**36** *(19 + 17)*

**51 ** *(19 + 17 + 15)*

**71 ** * (19 + 17 + 15 + 20)*

**80 ** *(19 + 17 + 15 + 20 + 9)*

3.

**Provide an appropriate response.**

The frequency distribution below summarizes employee years of service for Alpha Corporation.

Find the class boundaries for class 26-30.

**25.5, 30.5**

4.

**Provide an appropriate response.**

The histogram below represents the number of television sets per household for a sample of U.S.households.

How many households are included in the histogram?

**100**

*sum total of frequencies*

*= (20 + 50 + 15 + 10 + 5)*

5.

**Provide an appropriate response.**

The frequency distribution below summarizes employee years of service for Alpha Corporation.

Find the class midpoint for class 1-5.

**3.0**

*midpoint = (1 + 5) ÷ 2 = 3.0*

6.

**Provide an appropriate response.**

Sturges' guideline suggests that when constructing a frequency
distribution, the ideal number of classes can be approximated by
**1 + (log n)/(log 2)**, where n is the number of data values.

Use this guideline to find the ideal number of classes when the number of data values is 146.

**8**

*1 + ( log(146) ) ÷ ( log(2) )*

*= 8.2*

7.

**Use the given paired data to construct a scatterplot.**

8.

**Solve the problem.**

At the National Criminologists Association's annual convention, participants filled out a questionnaire asking what they thought was the most important cause for criminal behavior. The tally was as follows.

Construct a Pareto chart to display these findings.

9.

**Construct the dotplot for the given data.**

A store manager counts the number of customers who make a purchase in his store each day. The data are as follows.

15 16 13 19 12 15 15 16 13 12

10.

**Find the original data from the stemplot.**

7.11, 7.18, 7.28, 7.29, 7.31, 7.39, 7.39