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Unformatted text preview: Quiz 8 Solutions Course: Stat 231 Term: Spring 2010 Instructor: Dr. Jock MacKay Prepared by: Murshid Kuttihassan 1. A unit is Answer: B: a private well in Waterloo region A unit is a single member of a set of entities being studied. Each unit contributes a random variable. Here the random variable is the level of Sodium (Na) in the water. 2. The parameter μ represents Answer: C: the current average Na level in previously tested private wells in the Region of Waterloo Each Y i represents the current Na level in one of the 25 previously tested private wells in the Region of Waterloo. Y i = μ + R i E [ Y i ] = E [ μ ] + E [ R i ] = μ + 0 = μ 3. We are interested in assessing the hypothesis Answer: C: μ = 2 . 25 Since the goal is to see if the average level has changed, the hypothesis is μ = 2 . 25. 4. The degrees of freedom associated with ˆ σ are Answer: B: 24 The sample size is 25. 1 degree of freedom is lost while estimating the mean....
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