SOLUTION: A sample of 300 high school juniors found that 195 of them took the SAT more than once. Find the 99% confidence interval for the proportion of all high school juniors who took the

Question 1141191: A sample of 300 high school juniors found that 195 of them took the SAT more than once. Find the 99% confidence interval for the proportion of all high school juniors who took the SAT more than once.
Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
The point estimate of the probability is 195/300=0.65
the 99% CI is p hat, 0.65 +/- z (2.576 for 99% CI) *sqrt(p(1-p)/n), which is sqrt (0.65*0.35/300)
this is 0.65+/-2.576*0.0275
=0.65+/-0.0709
(0.58, 0.72)
RELATED QUESTIONS
How do I work these problems out? 1. A study of 40 people found that they could do on... (answered by ikleyn)

The population of the scores of all high school seniors that took the SAT-M test... (answered by jim_thompson5910)

A random sample of 225 SAT scores has a mean of 1522. Assume that SAT scores have a... (answered by stanbon)

Could someone please explain this to me? I'm having a really hard time understanding how... (answered by rothauserc)

Could someone please help with this?: The SAT math scores for all seniors in a high... (answered by ewatrrr)

A sample of 195 students found that 27% had a GPA lower than 1.89. The population from... (answered by stanbon)

From a random sample of 70 high school seniors in a particular school district , the mean (answered by rothauserc)

A random sample of 225 adults was given an IQ test. It was found that 117 of them scored... (answered by Theo)

It is known that the population mean for the verbal section of the SAT is 500 with a... (answered by Theo)