2-23-09 - Economic Statistics Class Notes 2/23/09 HOMEWORK...

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Economic Statistics – Class Notes – 2/23/09 HOMEWORK PROBLEMS: 8.13 – pp. 288 8.16 – pp. 289 8.27 – pp. 294 9.27 – pp. 321 9.29 – pp. 321 These problems represent each problem type! For confidence intervals, you need to find a Z value for both sides of the normal distribution (it’s an interval). o It’s for hypothesis testing that you need to worry about 1-tailed or 2-tailed test.
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WORKSHEET 2. A political scientist is interested in the amount of time voters spend in the voting booth. A random sample of sixty-four voters showed an average of 8.24 minutes in the booth and a standard deviation of 2.56 minutes. Find an 80% confidence interval for the mean amount of time spent by all voters in the voting booth.
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IMPORTANT: We know that the sample size is larger than 30 for this problem (n = 64) o Thus, we know that the sample standard deviation is approximately the same as the population standard deviation o
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2-23-09 - Economic Statistics Class Notes 2/23/09 HOMEWORK...

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