practice-midterm2

practice-midterm2 - STAT 20 - Fall 2011 - Practice Midterm...

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STAT 20 - Fall 2011 - Practice Midterm 2 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. 2. Use the normal tables in the back of the book. 1. A researcher collects data consisting of (father’s height, son’s height) for a random sample of households in a certain city. The average height of the fathers is 69 inches and the average height of the sons is 70 inches. Both have standard deviations of 2 inches, and the correlation is 0.5. (a) Terry, one of the fathers interviewed, is taller than 38% of the fathers. In what percentile of the sons’ heights do you expect his son Weston to be? Assume the scatter plot is football-shaped. (b) The researcher wants to know the mean and standard deviation among all sons whose fathers were in the 38th percentile. What do you say? (Hint: save time by reusing your calculations from part (a).) (c) Without doing any long calculations, can you say what your answer
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This note was uploaded on 11/03/2011 for the course STAT 20 taught by Professor Staff during the Fall '08 term at Berkeley.

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practice-midterm2 - STAT 20 - Fall 2011 - Practice Midterm...

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