Question: The level of dissolved oxygen in a river is an important indicator of the water’s ability to support aquatic life. You collect water samples at 15 randomly chosen locations along a stream and measure the dissolved oxygen. Here are your results in milligrams per liter:

Test to determine if the level of dissolved oxygen in this river is below the 5.4 milligrams per liter that is recommended by the US Fish and Wildlife Service. Carry out an appropriate test of this claim at the α=0.05 level.

1. State the hypotheses and identify the claim.
2. Given an =0.05 , what type of test is used (left tailed, right tailed or two-sided tail) and what is the critical t-value?
3. Compute the test value.
4. Make the decision.
5. Summarize the results.

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Solution: The downloadable solution consists of 2 pages
Deliverable: Word Document