Quiz_8_Questions

Quiz_8_Questions - Quiz 8 Questions A few years ago an...

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Quiz 8 Questions A few years ago, an extensive survey of private water wells in the Region of Waterloo showed that the average level of Sodium (Na) in the water was 2.25 mg/l. To determine if the average level has changed, a random sample of 25 wells was selected from the list of all wells tested in the previous survey. The Na level was re-measured in each of the selected wells. The sample average and standard deviation are 2.33 and 0.17 mg/l. Consider the model , ~ (0, ), 1,...,25 independent i i i Y R R G i μ σ = + = . 1. (1 mark) A unit is A: a test of the Na level B: a private well in Waterloo region C: mg/l D: all wells in the Region of Waterloo 2. (1 mark) The parameter μ represents A: the average Na level in the sample B: 2.25 μ = C: the current average Na level in previously tested private wells in the Region of Waterloo D: the predicted value of the Na level in a well sampled at random 3. (1 mark) We are interested in assessing the hypothesis A: ˆ μ μ = B: ˆ μ μ C: 2.25 μ = D: 2.25 μ 4.

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