EBook Problems Contingency Indep

EBook Problems Set - Contingency Tables: Independence and Homogeneity Problems

Problem 1

Here is a table of the eye color for 80 UCLA students enrolled in a recent statistics course and whether or not a student wears glasses or some other type of prescription/corrective lenses.

_	Wears glasses / Lenses	Does not wear glasses / Lenses	_
Dark-eyed	_	_	_
Black	4	2	6
Brown	19	35	54
Light-eyed	_	_	_
Blue	8	4	12
Green	2	3	5
Hazel	1	2	3

Use the data from the table to answer this and the next 3 questions.

What percent of these UCLA statistics students are dark-eyed?

• Choose one answer.

(a) 23/60 = 38.3%

(b) None of these values

(c) 23/80 = 28.8%

(d) 60/80 = 75%

(e) 37/60 = 61.7%

Answer

 (d)

Problem 2

What percent of dark-eyed students wear corrective lens?

• Choose one answer.

(a) 60/80 = 75%

(b) 37/60 = 61.7%

(c) 23/80 = 28.8%

(d) None of these values

(e) 23/60 = 38.3%

Answer

 (e)

Problem 3

What percent of students who wear lenses are dark-eyed?

• Choose one answer.

(a) 23/34 = 67.6%

(b) 23/80 = 28.8%

(c) 34/80 = 42.5%

(d) 34/60 = 56.7%

(e) 23/60 = 38.3%

Answer

 (a)

Problem 4

The professor found a pair of prescription glasses on the ground after class, what are the chances that the glasses belong to a dark-eyed student?

• Choose one answer.

(a) 34/80 = 42.5%

(b) 23/34 = 67.6%

(c) 23/80 = 28.8%

(d) 34/60 = 56.7%

(e) 23/60 = 38.3%

Answer

 (b)

Problem 5

Jenny took a random sample of 250 males and a separate random sample of 270 females at UCLA. She asks them whether their major is science related, math related, social science related, or other type of field. She then constructs a contingency table of gender (two rows) by major (four columns). She wants to find out whether males and females differ in their choice of major. Which of the following should she examine?

• Choose one answer.

(a) Row percentages

(b) Column marginals

(c) Cell percentages

(d) Column percentages

(e) Cell frequencies

(f) Row marginals

Answer

 (a)

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• SOCR Home page: http://www.socr.ucla.edu

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