Question

1. The amount of dissolved oxygen in a river is an important indicator of the water’s ability to support life. A researcher collects water samples at 15 randomly chosen locations along a river and measures the level of dissolved oxygen. Here are the results in milligrams per liter:
   
   4.53   5.04    3.29    5.23    4.13    5.50    4.83    4.40    5.42    6.38    4.01    4.66    2.87    5.73    5.55
   
   
   1. What t-score should be used to compute a 95% confidence interval using this data?
      
      
   2. Using your calculator, report and interpret a 95% confidence interval for the average level of dissolved oxygen in the entire river.

Answer 1

answered by: anonymous