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 believes 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? 1st Survey 2nd Survey Optimistic Slightly Optimistic | Slightly Pessimistic | 40% 25 % 24 % 11% 42 % 33 % 15% 10% Copy Data Step 4 of 10: Find the expected value for the number of respondents who are optimistic. Round your answer to two decimal places Answer How to enter your answer

Explanation / Answer

here as we known that expected value =total respondents*expected propotion

therefore expected value of the number of respndents who are optimistic

E (noptimistic) =370*0.40=148

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