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Material Type: Quiz; Class: BASIC STATISTICS; Subject: Statistics; University: University of Washington - Seattle; Term: Spring 2008;
Typology: Quizzes
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Name (print):
Section:
This is Quiz 1 for Stat220. There are 4 questions for a total of 21 points. You have 20 minutes to work on this quiz.
Exam rules:
Good luck!!
Honor statement: I certify that this quiz is completely my own work, and that I followed the code of conduct as outlined in point 6 above.
Signature:
Q1 (4 pt) Q2 (7 pt) Q3 (4 pt) Q4 (6 pt) Subtotal (21pt) Extra credit (2 pt) Total
(4) 1. What is a probability sample?
(4) 3. A histogram of monthly wages for part-time employees is shown below (densities are marked in parentheses). Nobody earned more than $1,000 a month. The block over the class interval from $200 to $500 is missing. How tall must it be?
Wages (hundreds of dollars)
% per $
(10)
(20)
(5)
0 1 2 3 4 5 6 7 8 9 10
0
10
20
Solution:
(2) (a)Average
(2) (b)Deviations from Average
(2) (c)SD
(d) (Extra credit) Now find the SD of the list 3, 9, 12, 15, 21 (2 points)