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The National Assessment of Educational Progress (NAEP) administers tests each year in a variety of subjects...

The National Assessment of Educational Progress (NAEP) administers tests each year in a variety of subjects to a random sample of elementary and secondary students in the United States. In 1975, for a given question on the mathematics portion of the test, 617 of the 950 students got the answer correct.

a. Construct a 95% confidence interval for the proportion of students who got the answer correct in 1975.

b. If the same test were given again today, how many students would need to be sampled in order to  be 95% sure of getting the percentage, p, correct within 2 percentage points?

math   Statistics-And-Probability   
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Answer #1

n: aso Stadtds l X :- , 17 (students got (met an/wer d aoe2 The the g 5./. С:工:fer the proportion of stude rt 0,02 11-96 ←-10

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