Please help cannot figure these problems out.

Question 1

Listed below are measured amounts of lead (in micrograms per cubic meter, or ug divided by g/ m3 ) in the air. The EPA has established an air quality standard for lead of 1.5 g/ 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. Is there anything about this data set suggesting that the confidence interval might not be very good? 5.40 1.20 0.48 0.75 0.68 1.20 What is the confidence interval for the population mean ? Show work.

_____g/ m3 >> _____g/ m3 (round 3 decimal places as needed)

Question 2

Listed Below are the amounts of mercury (in parts per million) found in tuna sushi sampled at different stores. The sample mean is 1.017 ppm and the sample standard deviation is 0.285 ppm. Use technology to construct a 90% confidence interval estimate of the mean amount of mercury in the population.

1.37 0.81 0.84 1.13 0.99 1.36 0.62

What is the confidence interval estimate of the mean amount of mercury in the population?

___ppm