# Economics 395 Assignment #1

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Economics 395 Spring 2014

Due May 29th, 2014, before 3 pm Assignment #1

Due Thursday, May 29th, by 3 pm in the Economics Office, SS 454. The office is

closed during lunch hour, noon – 1 pm.

Please remember to do a cover sheet with your name(s), the course number, number all the

pages, clearly label which question and part you are answering, and staple your

assignment.

1. Express each of the following sums in summation notation and then compute where

possible. Let X take the values �1 = −2, �2 = −1, �3 = 0, �4 = 1, �5 = 2 and Y take the

values �1 = −1, �2 = −0.5, �3 = 0, �4 = 1, �5 = 1.5.

a) �1 + �2 + �3 + �4 + �5

b) �3 + �4 + �5

c) (�1 − �1) + (�2 − �2) + (�3 − �3) + (�4 − �4) + (�5 − �5)

d) 2(�1 ∗ �2) + 2(�2 ∗ �3) + 2(�3 ∗ �4)

e) (�2/�1) + (�3/�2) + (�4/�3)

f) (�1

2

∗ 2�3) + (�2

2

∗ 2�4) + (�3

2

∗ 2�5)

2. Show that ∑ (�

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