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practice-midterm 1

practice-midterm 1 - STAT 20 Fall 2011 Practice Midterm 1...

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STAT 20 - Fall 2011 - Practice Midterm 1 Most explanations require just a sentence or two. On calculations, show your work and work through to a numerical answers, upto at least 2 decimal places. 1. Below are the statistics of 3 lists of numbers. The average of each list is 100. For each, write whether the SD is around 2,4, or 20. Explain your reasoning briefly. (a) 50% of the entries are 98 and 50% are 102. (b) 5% of the entries are 60, 35% are 80, 20% are 100, 35% are 120 and 5% are 160. (c) 10% of the entries are 92, 10% are 94, 10% are 96, 10% are 98 and 30% are 102, 20% are 104 and 10% are 106. 2. In HANES5, the men age 18 and over had an average height of 69 inches and an SD of 3 inches. The histogram of heights followed the normal curve. Amongst the men who are at least 6 feet tall, about what percentage are taller than 6’3”? If it is not possible to estimate this percentage with the information given, explain why not. 3. Weights of healthy newborn babies follow the normal curve. The weight of a baby at the 25th percentile is 4 lb while the weight of a baby at the 90th percentile is 13lb. Is it possible to estimate the weight of a baby at the 50th
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