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
5.40,1.00,0.34,0.68,0.66, 1.20
What is the confidence interval for the population mean __ ug/m3< u< __ug/m3 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