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Lenses

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• Lucy Van Pelt

This collection is included inLens: Lucy's Lens
By: Tahiya Marome

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Inside Collection (Textbook):

Textbook by: Barbara Illowsky, Ph.D., Susan Dean. E-mail the authors

Review

Summary: This module provides a number of homework/review exercises related to Probability.

The first six exercises refer to the following study: In a survey of 100 stocks on NASDAQ, the average percent increase for the past year was 9% for NASDAQ stocks. Answer the following:

Exercise 1

The “average increase” for all NASDAQ stocks is the:

• A. Population
• B. Statistic
• C. Parameter
• D. Sample
• E. Variable

• C. Parameter

Exercise 2

All of the NASDAQ stocks are the:

• A. Population
• B. Statistic
• C. Parameter
• D. Sample
• E. Variable

Solution

• A. Population

Exercise 3

9% is the:

• A. Population
• B. Statistic
• C. Parameter
• D. Sample
• E. Variable

• B. Statistic

Exercise 4

The 100 NASDAQ stocks in the survey are the:

• A. Population
• B. Statistic
• C. Parameter
• D. Sample
• E. Variable

• D. Sample

Exercise 5

The percent increase for one stock in the survey is the:

• A. Population
• B. Statistic
• C. Parameter
• D. Sample
• E. Variable

• E. Variable

Exercise 6

Would the data collected be qualitative, quantitative – discrete, or quantitative – continuous?

Solution

quantitative - continuous

The next two questions refer to the following study: Thirty people spent two weeks around Mardi Gras in New Orleans. Their two-week weight gain is below. (Note: a loss is shown by a negative weight gain.)

Table 1
Weight Gain Frequency
-2 3
-1 5
0 2
1 4
4 13
6 2
11 1

Exercise 7

Calculate the following values:

• a. The average weight gain for the two weeks
• b. The standard deviation
• c. The first, second, and third quartiles

• a. 2.27
• b. 3.04
• c. -1, 4, 4

Exercise 8

Construct a histogram and a boxplot of the data.

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| 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

Module to:

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