Intro to Stat_Part_29

Intro to Stat_Part_29 - 101 Exercise 6.6 In the 1992...

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101 Exercise 6.6 In the 1992 presidential election, Alaska’s 40 election districts averaged 1956.8 votes per district for President Clinton. The standard deviation was 572.3. (There are only 40 election districts in Alaska.) The distribution of the votes per district for President Clinton was bell-shaped. Let X = number of votes for President Clinton for an election district. (Source: The World Almanac and Book of Facts ) a. State the approximate distribution of X . X b. Is 1956.8 a population mean or a sample mean? How do you know? c. Find the probability that a randomly selected district had fewer than 1600 votes for President Clinton. Sketch the graph and write the probability statement. d. Find the probability that a randomly selected district had between 1800 and 2000 votes for President Clinton. e. Find the third quartile for votes for President Clinton. Exercise 6.7 (Solution on p. 107.) Suppose that the duration of a particular type of criminal trial is known to be normally distributed with a mean of 21 days and a standard deviation of 7 days. a. In words, define the random variable X . X = b. X c. If one of the trials is randomly chosen, find the probability that it lasted at least 24 days. Sketch the graph and write the probability statement. d. 60% of all of these types of trials are completed within how many days? Exercise 6.8
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This document was uploaded on 10/31/2011 for the course STA 2023 at University of Florida.

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Intro to Stat_Part_29 - 101 Exercise 6.6 In the 1992...

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