A newspaper found that, on average, 7.6% of people stay overnight in the hospital with a 1.5% margin of error. Construct a 95% confidence interval.

Given:

p = 7.6% = 0.076, the percentage of people who stay overnight at the hospital.

E = 1.5% = 0.015, margin of error

95% confidence interval.

The standard error is

Es = / sqrt{ / frac{p (1-p) }{n} }

where

n = the sample size.

The margin of error is

E=z^{*}E_{s}

where

z * = 1.96 at the 95% confidence level.

Because the margin of error is given, there is no need to calculate it.

The 95% confidence interval is

p + / - E = 0.076 + / - 0.015 = (0.061, 0.091) = (6.1%, 9.1%)

Answer:

The 95% confidence interval is between 6.1% and 9.1%.