College Of The Canyons Math 140 Exam 1 Amy Morrow (Page 2 of 8) in pdf

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College of the Canyons

Math 140 Exam 1

Amy Morrow

B. had a pH 1.8 higher than that of average rainwater

C. had a pH 1.8 time that of average rainwater

D. had a pH of 1.8

E. had a pH 1.8 standard deviations higher than that of average rainwater

4. 192 students in an Intro Stats course were asked to describe their politics as “Liberal”, “Moderate”, or

“Conservative”. Here are the results:

Female

Male

(a) What percent of the class is female?

(a)

Solution: 77/192 = .401

(b) What percent of conservative students are female?

(b)

Solution: 6/27 = .222

(c)

Solution: 6/77 = 0.078

(d) What percent of all students in the class are females who consider themselves conservative?

(d)

Solution: 6/192 = 0.031

(e) Below is a graph of the data above, using per-

cents. Based on this graph, can we conclude that

the variables are dependent? Why or why not?

Solution: Yes. The distribution of gender is NOT the same for all political orientations.

5. A statistics teacher kept track of the number of

histogram.

emails each student sent over the course of one

term. Answer the following questions based on the

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College Of The Canyons Math 140 Exam 1 Amy Morrow Page 2