QUESTION 1 1. Suppose you are testing ground water samples for the presence of n

Question

QUESTION 1 1. Suppose you are testing ground water samples for the presence of nitrates (originating from fertilizer application and animal feed lots). A level of nitrates of more than 10 mg/L would be cause for alarm. You decide to perform a statistical hypothesis test to determine from the nitrate concentrations in 16 ground water samples whether the nitrate concentration is above the threshold of 10 mg/L. Which of the following tests would you use? c This two-sided test. Ho: 10 mg/L H1 k t 10 mg/L c This one-sided test. Ho: w as 10 mg/L H1: H

Explanation / Answer

Solution:-

1. The two sided test
Ho : mu = 2.4 cm
H1 : mu not = 2.4 cm

2. C,A,B is the correct order.

3. C,B,A is the correct order.

4. C,A,B is the correct order.

5. C,A,B is the correct order.

6. False, Larger P-value, Ho cannot be rejected.

7. True.

8. Type I error is "a false positive", that is incorrect rejection of a true null hypothesis.
(B) is correct.

9. Type II error is incorrectly retaining a false null hypothesis (a "false negative").   
(C) is correct.

10. Type I error is "a false positive", that is incorrect rejection of a true null hypothesis.
(B) is correct.

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