EBook Problems Contingency Indep

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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%


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%


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%


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%





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