Several years ago 37% of parents who had children in grades K-12 were satisfied

Question

Several years ago 37% of parents who had children in grades K-12 were satisfied with mo quality of education the students receive A recent poll asked 1.16b parents who have children in grades K-12 it they were satisfied with the quality of education the students receive Of the 1.165 surveyed 411 indicated that they wore satisfied Construct a 90% confidence interval to assess whether this represents evidence that parents' attitudes toward the quality of education have changed. (Round to two decimal places as needed) Use technology to find the 90% confidence interval (Round to two decimal places as needed) Enter your answer in the cat fields and then click Check Answer.

Explanation / Answer

p, the actual pop proportion = .37
p', the sample. proportion = 477/1165 = .409

So, The CI is .37 +/- Z90*sqrt(.37*.63/1165)
=.37+/-1.645*sqrt(.37*.63/1165)

So, the CI is .35 to .39

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