320_hw9

# 320_hw9 - Economic Statistics Homework 9 Confidence...

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Economic Statistics: Homework 9 Confidence Interval Estimation of the Population Variance: 1. The weights of 20 oranges (in ounces) are shown below. 5.5 6.25 6.25 6.5 6.5 7 7 7 7.5 7.5 7.75 8 8 8.5 8.5 9 9 9.25 10 10.5 Hypothesis Testing: 2. When an Olympic athlete is tested for performance enhancing drugs like steroids, the presumption is that the athlete is in compliance with the rules. Samples are taken as evidence. a. State the null and alternative hypothesis. b. Describe what the Type I and Type II error would be for this type of test. c. Which error is more to be feared? 3. The width of a sheet of standard size copier paper should be 216mm (8.5 inches). There is some variation in paper width due to the nature of the production process and the population variance is 0.84mm. However, only a certain number of nonconforming sheets per million are allowed by industry standards. Samples are taken and the mean is used to test a hypothesis. a.

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320_hw9 - Economic Statistics Homework 9 Confidence...

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