The level of dissolved oxygen in a river is an important indicator of the water’s ability to support aquatic life. A research project is started to determine if the oxygen levels in the river have changed. It is known from a study done 10 years prior, that the mean oxygen levels in milligrams per liter for the river was 4.3.
a- Write appropriate hypotheses for this test
b- You collect water samples at 15 randomly chosen locations along the river and measure the dissolved oxygen. Here are your results in milligrams per liter:
Construct and interpret a 95% confidence interval for the mean dissolved oxygen level for this stream.
c- Using the sample from part b, conduct a significance test of these results using a 5% significance level. Give complete results of the test including a p-value and an interpretation of the test results that someone not in this class could understand
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