conducted a survey of the attitude towards the sustainability of American energy

Question

conducted a survey of the attitude towards the sustainability of American energy consumption with 370 randomly selected individuals several years ago. The psychologist beleves that these attitudes have changed over time. To test this he randomly selects 370 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 40% 42 % Slightly Optimistic | 25 % Slightly Pessimistic| 24 % | 15 33 % Pessimistic 11% 10% Copy Data Step 10 of 10: State the conclusion of the hypothesis test at the 0.005 level of significance. Answer Previous Step Answers Table of Expected Values G There is not enough evidence to confirm that the attitudes toward sustainability have changed O There is enough evidence to confirm that the attitudes toward sustainability have

Explanation / Answer

applying chi square goodness of ft test:

as test statistic 22.666 is higher than critical value 7.815 ; therefore we reject null hypothesis

there is enough evidence to confirm that the attitude toward sustainability have charged,

observed Expected Chi square category Probability(p) Oi Ei=total*p R2i=(Oi-Ei)2/Ei Optimistic 0.400 155.400 148.000 0.370 Slightly optimistic 0.250 122.100 92.500 9.472 Slightly pessimistic 0.240 55.500 88.800 12.488 pessimistic 0.110 37.000 40.700 0.336 total 1.000 370 370 22.666

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