# Connexions

You are here: Home » Content » Elementary Statistics: Quiz 2: Descriptive Statistics

### Recently Viewed

This feature requires Javascript to be enabled.

# Elementary Statistics: Quiz 2: Descriptive Statistics

Summary: This module is a quiz containing 10 multiple choice questions covering topics related to descriptive statistics. This module is part of a set of companion resources to Collaborative Statistics (col10522) by Barbara Illowsky and Susan Dean.

The following table shows the lengths of 64 international phone calls using a $5 prepaid calling card. Table 1: Frequency of Phone Call Lengths Data (minutes) Frequency Relative Frequency Cumulative Relative Frequency 4 25 0.3906 14 15 24 10 0.1563 34 9 0.1406 44 4 0.0625 54 1 0.0156 1.0000 Using the data, determine which ONE of the answers is correct: • A. The mean and the median are equal. • B. The mean is smaller than the median. • C. The mean is larger than the median. ## Exercise 2 Interpret the following box plot: Which of the following is correct? • A. 75% of the data are at most 5. • B. There is about the same amount of data from 2-5 as there is from 5-7. • C. There are no data values of 3. • D. 50% of the data are 4. ## Exercise 3 In a set of data, if all of the data appear with the same frequency, then: • A. The standard deviation is always 0. • B. The mean is always larger than the standard deviation. • C. All of the data have the same value. • D. The boxplot does not always look symmetrical. ## Exercise 4 The following table shows the lengths of 64 international phone calls using a$5 prepaid calling card.

Table 2: Frequency of Phone Call Lengths
Data (minutes) Frequency Relative Frequency Cumulative Relative Frequency
4 25 0.3906
14 15
24 10 0.1563
34 9 0.1406
44 4 0.0625
54 1 0.0156 1.0000

Find the 60th percentile.

• A. 14
• B. 60
• C. 15
• D. 0.2344

## Exercise 5

Consider the following data set:

4; 6; 6; 12; 18; 18; 18; 200

What value is 2 standard deviations above the mean?

• A. There is not enough information
• B. Approximately -98
• C. Approximately 102
• D. Approximately 169

## Exercise 6

Consider the following data:

14; 16; 16; 22; 25; 38; 38; 38; 38; 2000

Which of the measures of central tendency would be the least useful?

• A. mean
• B. mode
• C. median

## Exercise 7

The following table shows the lengths of 64 international phone calls using a \$5 prepaid calling card.

Table 3: Frequency of Phone Call Lengths
Data (minutes) Frequency Relative Frequency Cumulative Relative Frequency
4 25 0.3906
14 15
24 10 0.1563
34 9 0.1406
44 4 0.0625
54 1 0.0156 1.0000

What percent of the data is either 34 or 44 minutes?

• A. Approximately 78%
• B. Approximately 13%
• C. Approximately 98%
• D. Approximately 20%

## Questions 8 – 10 refer to the following:

Sixty-four faculty members were asked the number of cars they owned (including spouse's and children's cars). The results are given in the histogram below:

## Exercise 8

The number of responses that were either "1" or "3" is approximately:

• A. 0.4
• B. 27
• C. 40
• D. 2

## Exercise 9

Which of the following DOES NOT describe the data?

• A. there are approximately 10 faculy members that own 7 cars
• B. skewed left
• C. There are no values of 5
• D. skewed right

## Exercise 10

The third quartile is:

• A. 1
• B. 2
• C. 3
• D. 0.75

## Content actions

PDF | EPUB (?)

### What is an EPUB file?

EPUB is an electronic book format that can be read on a variety of mobile devices.

My Favorites (?)

'My Favorites' is a special kind of lens which you can use to bookmark modules and collections. 'My Favorites' can only be seen by you, and collections saved in 'My Favorites' can remember the last module you were on. You need an account to use 'My Favorites'.

| A lens I own (?)

#### Definition of a lens

##### Lenses

A lens is a custom view of the content in the repository. You can think of it as a fancy kind of list that will let you see content through the eyes of organizations and people you trust.

##### What is in a lens?

Lens makers point to materials (modules and collections), creating a guide that includes their own comments and descriptive tags about the content.

##### Who can create a lens?

Any individual member, a community, or a respected organization.

##### What are tags?

Tags are descriptors added by lens makers to help label content, attaching a vocabulary that is meaningful in the context of the lens.

| External bookmarks