With data from the 2009 national health interview survey, the centers for disease control estimated that 9.4% of u. s. children had asthma. suppose that 12% of a random sample of 500 u. s. poor children have asthma.
we used the estimate from the 2009 national health interview survey to calculate a standard error of 0.013. the data allows the use of a normal model. so we can find an approximate 95% confidence interval for the percentage of all u. s. poor children who have asthma.
which interval is the approximate 95% confidence interval?
0.107 to 0.133
0.094 to 0.146
0.026 to 0.214
0.068 to 0.12