SolutionsTo343-02#1Sp05-1 - Solutions CIS 343-02 Exam#1...

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Solutions CIS 343-02 Exam #1 Spring 2005 T or F 1. A 95% confidence interval is wider than a 90% confidence interval. Ans. = True T or F 2. A poll cannot have both selection bias and non response bias at the same time. Ans. = False 4. On the normal curve Find the area a) between -.33 and 1.33 Ans. = .9082 - .3707 = .5375 b) to the right of -1.49 Ans. = .9319 = area to left of 1.49 Find z if the area c) to the left of z is .5438 Ans. z=.11, area to the left is bigger than .5 means z is positive, finding .5432 in the body of the z table gives z=.11 d) to the right of z is .1788 Ans. z=.92, area to the right is less than .5 means z is positive, finding 1-.1788 = .8212 in the body of the z table gives z=.92 6. The weatherman wants to find a confidence interval for how often it rains in Murray during the month of March. The standard deviation for how often it rains in March is 3 times for the month. In a sample, over the last 10 years, of the last 10 Marches it rained on average 9 times per month. Find a 80% confidence interval.
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