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Name: A psychologist conducted a survey of the attitude towards the sustaina
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Description: A psychologist conducted a survey of the attitude towards the sustainability of American energy consumption with 380380 randomly selected individuals several years ago. The psychologist believes that these attitudes have changed over time. To test th

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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A psychologist conducted a survey of the attitude towards the sustainability of American energy consumption with 380380 randomly selected individuals several years ago. The psychologist believes that these attitudes have changed over time. To test this he randomly selects 380380 individuals and asks them the same questions. Can the psychologist confirm his theory that the attitudes have changed from the first survey to the second survey?

Attitude	1st Survey	2nd Survey
Optimistic	6%6%	7%7%
Slightly Optimistic	30%30%	26%26%
Slightly Pessimistic	21%21%	24%24%
Pessimistic	43%43%	43%43%

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Step 3 of 10 :

State the null and alternative hypothesis in terms of the expected proportions for each category.

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