A Group of Concerned Citizens Are Collecting Water Samples from a Local

question 9

Multiple Choice

A group of concerned citizens are collecting water samples from a local river to detect the level of nitrogen in the water. They plan to take samples every day for a month and then will divide the sum by the number of days they sampled. What is the group trying to do?

• A) determine the mean level of nitrogen in the water
• B) determine the average level of nitrogen in the water
• C) determine the confidence level of the sample
• D) both determine the mean level of nitrogen in the water and determine the average level of nitrogen in the water
• E) both determine the average level of nitrogen in the water and determine the confidence level of the sample