# hypothesis test question

• May 11th 2006, 12:28 PM
aptiva
hypothesis test question
i need an explanation as to how an answer of 0.891 is obtained in this question..theres just too much info ... its leaving me all confused

In a recent survey, 480 of 600 Canadians polled stated that they were dissatisfied with politicians. Of the remaining 120 who were polled, 75% were satisfied with politicians and 25% had no opinion. Assuming that these findings can be generalized to all canadians.

In a second study, the news service tries out the new approach to presenting information on a random sample of 25 people who initially expressed no opinion about an issue. The news service will test the hypothesis that the new approach is more successful than previous methods in getting people to form an opinion using alpha < 0.03. Suppose that the new approach would actually cause 80% of initially no-opinion people to form a definite opinion. Given this, what is the probability that the news service will draw the correct conclusion based upon their second study.
• May 11th 2006, 04:51 PM
JakeD
Quote:

Originally Posted by aptiva
i need an explanation as to how an answer of 0.891 is obtained in this question..theres just too much info ... its leaving me all confused

In a recent survey, 480 of 600 Canadians polled stated that they were dissatisfied with politicians. Of the remaining 120 who were polled, 75% were satisfied with politicians and 25% had no opinion. Assuming that these findings can be generalized to all canadians.

In a second study, the news service tries out the new approach to presenting information on a random sample of 25 people who initially expressed no opinion about an issue. The news service will test the hypothesis that the new approach is more successful than previous methods in getting people to form an opinion using alpha < 0.03. Suppose that the new approach would actually cause 80% of initially no-opinion people to form a definite opinion. Given this, what is the probability that the news service will draw the correct conclusion based upon their second study.

These paragraphs don't seem to be connected. The first talks about a survey; the second talks about a study. The second paragraph also talks about "the new approach" and "previous methods" but there is no description of these. When it says "the new approach is more successful than previous methods," how successful were the previous methods? What do you compare the 80% to? No telling from this. I'd say the question is faulty and cannot be answered.
• May 15th 2006, 11:29 AM
aptiva
oh sorry
there were few part questions before that one that i didnt see so thats why this question doesnt make sense

the question i posted was part D

In a recent survey, 480 of 600 Canadians polled stated that they were dissatisfied with politicians. Of the remaining 120 who were polled, 75% were satisfied with politicians and 25% had no opinion. Assuming that these findings can be generalized to all canadians.

A) In a random sample of 4 canadians, what is the probability that no more than 1 would be satisfied with politicans?