SolutionsTo343-03#1sp03 - Solutions CIS 343-03 Exam#1...

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Solutions CIS 343-03 Exam #1 Spring 2003 1. T or F A confidence interval will always include X . Ans. = True 2. T or F Exclusion bias occurs when some questions in a survey are not answered and therefore the answer is excluded. Ans. = False 3. T or F The Central Limit Theorem says that the probability that X is closer to increases. Ans. = False 5. On the normal curve find the area a) between -1.28 and -.63 Ans. = .2643 - .1003 = .1640 b) to the right of .66 Ans. = area left of -.66 = .2546 Find z if the area c) to the right is .8888 Ans. z=-1.22, large area to the right means z is negative, finding .8888 in the body of the z table gives z=1.22 d) to the right of z is .0033 Ans. z=2.72, small area to the right means z is positive, finding .0033 in the body of the z table gives z=-2.72 7. In the winter in Kentucky it usually snows twice per winter with a standard deviation of 1 snow per winter. In the past two winters it has snowed on average 5 times per winter. At level of significance .10 has it snowed more often than usual.
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