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)

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