Answer
(a) $∑X=4$
(b) $∑Y=18$
(c) $∑XY=11$
Work Step by Step
(a) $∑X=3+0+(-1)+2=4$
(b) $∑Y=4+7+5+2=18$
(c) $∑XY=3\times4+0\times7+(-1)\times5+2\times2=12+0-5+4=11$
Essentials of Statistics for the Behavioral Sciences 8th Edition
by Gravetter, Frederick J.; Wallnau, Larry B.
Published by
Cengage Learning
ISBN 10:
1133956572
ISBN 13:
978-1-13395-657-0
Chapter 1 - Introduction to Statistics - Problems - Page 34: 21
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