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 330 randomly selected individuals several years ago. The psychologist believes that these attitudes have changed over time. To test this he randomly selects 330 individuals and asks thern 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 32% Slightly Optimistic | 6 % slightly pessimistic | 24 % 38% 25 % 9% 28 % 38 % Pessimistic Copy Data Step 9 of 10: Make the decision to reject or fail to reject the null hypothesis at the 0.01 level of significance Answer Previous Step Answers G Fail to Reject Null Hypothesis Reject Null

Explanation / Answer

applyijng chi square goodness of fit test:

here as test statistic 12.203 is higher than crtiical value 11.345 ; theefore correct decision is :

reject null hypothesis

observed Expected Chi square category Probability(p) Oi Ei=total*p R2i=(Oi-Ei)2/Ei Optimistic 0.320 82.500 105.600 5.053 Slightly optimistic 0.060 29.700 19.800 4.950 Slightly pessimistic 0.240 92.400 79.200 2.200 pessimistic 0.380 125.400 125.400 0.000 total 1.000 330 330 12.203

Related Questions

Navigate

• Browse (All)
• Browse C
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.