1 5/7 points | Previous Answers BaldiStat3 14.E.017 My Notes Ask Your Teacher An

Question

1 5/7 points | Previous Answers BaldiStat3 14.E.017 My Notes Ask Your Teacher An environmentalist group collects a liter of water from each of 47 random locations along a stream and measures the amount of dissolved oxygen in each specimen. The mean is 4.73 milligrams (mg) Is this strong evidence that the stream has a mean oxygen content of less than 5 mg per liter? (Suppose we know that dissolved oxygen varies among locations according to a Normal distributions with = 1.01 mg. Use = 0.05.) mg p-value = Conclusion Reject Ho- There is no evidence that the stream has a mean oxygen content of less than 5 mg/l Fail to reject Ho. There is evidence that the stream has a mean oxygen content of less than 5 mg/l. Fail to reject Ho. There is no evidence that the stream has a mean oxygen content of less than 5 mg/1 Reject Ho- There is evidence that the stream has a mean oxygen content of less than 5 mg/l

Explanation / Answer

here std error=std deviation/(n)1/2=1.01/(47)1/2 =0.1473

hence z score =(X-mean)/std error =(4.73-5)/0.1473=-1.8327

p value =0.0334

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