Listed below are measured amounts of lead in the air. The EPA has established an air quality standard for lead of 1.5 mg/m3. The measurements shown below were recorded at a building on different days. Use the given values to construct a 95% confidence interval estimate of the mean amount of lead in the air
5.40 1.10 0.43 0.84 0.71 0.90
What is the confidence interval for the population mean is there anything about this data set suggesting that the confidence interval might not be very good?
a. yes, because the sample mean is greater than 1.5ug/m3
b. yes, because the confidence interval does not contain 1.5ug/m3
c. no, the data appears to be normally distributed
d. yes the value of 5.40 appers to be an outlier