a psychologist conducted a survey of the attitude towards the sustainability of american energy consumption with 270 randomly selected individuals several years ago. the psychologist believes that these attitudes have changed over time. to test this he randomly selects 270 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? attitude1st survey2nd survey optimistic10%2% slightly optimistic33a% slightly pessimistic7%7% pessimistic50p% step 3 of 10 : state the null and alternative hypothesis in terms of the expected proportions for each category.
