For a group experiment, your science class measured the fine-particulate concentrations in the air at random places around campus, and estimated a sample average of 22 μg/m3 (micrograms per cubic meter). If 144 readings were taken, and the standard deviation of the sample measurements was 4 μg/m3, you are 99.7% confident that actual concentration of fine particulates at the school is __________ .

A. 21.3 μg/m3 – 22.7 μg/m3
B. 21 μg/m3 – 23 μg/m3
C. 18 μg/m3 – 26 μg/m3
D. 21.7 μg/m3 – 22.3 μg/m3

Question

For a group experiment, your science class measured the fine-particulate concentrations in the air at random places around campus, and estimated a sample average of 22 μg/m3 (micrograms per cubic meter). If 144 readings were taken, and the standard deviation of the sample measurements was 4 μg/m3, you are 99.7% confident that actual concentration of fine particulates at the school is __________ .

 		A.	21.3 μg/m3 – 22.7 μg/m3
 		B.	21 μg/m3 – 23 μg/m3
 		C.	18 μg/m3 – 26 μg/m3
 		D.	21.7 μg/m3 – 22.3 μg/m3

campayne · Answer

I think it's B but don't get your hopes up. I only got that because I looked up the question in other sources

snowflakelove15 · Answer

It was B thank you!