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9) A local newspaper claims that 70% of the items advertised in its classifieds section are sold within 1 week of the first appearance of the ad. To check the validity of the claim, the newspaper randomly selected n = 25 advertisements from last year's classifieds and contacted the people who placed the ads. They found that 14 of the 25 items sold within a week. Based on the newspaper's claim, is it likely to observe x s 14 who sold their item within a week? 10) A random sample of 50 employees of a large company was asked the question, "Do you participate in the company's stock purchase plan?" The answers are shown below. yes no no yes no no yes yes no no no yes yes yes no Yes no no yes yes no yes yes no yes yes no yes yes yes yes no no yes yes yes yes yes no yes no yes yes no yes yes yes yes yes yes Use a 90% confidence interval to estimate the proportion of employees who participate in the company's stock purchase plan. 9) 10) 6) An ink cartridge for a laser printer is advertised to print an average of 10,000 pages. A 6) random sample of eight businesses that have recently bought this cartridge are asked to report the number of pages printed by a single cartridge. The results are shown. 9771 9811 9885 9914 9975 10,079 10,145 10,214 Assume that the data belong to a normal population. Test the null hypothesis that the mean number of pages is 10,000 against the alternative hypothesis p: 10,000. Use a = .10. 7) To help consumers assess the risks they are taking. the Food and Drug Administration 7) (FDA) publishes the amount of nicotine found in all commercial brands of cigarettes. A new cigarette has recently been marketed. The FDA tests on this cigarette yielded a mean nicotine content of 25.9 milligrams and standard deviation of 2.7 milligrams for a sample of n = 95 cigarettes. Find a 95% confidence interval for p. 8) The overnight shipping business has skyrocketed in the last ten years. The single greatest 8) predictor of a company's success is customer service. A study was conducted to determine the customer satisfaction levels for one overnight shipping business. In addition to the customer's satisfaction level, the customers were asked how often they used overnight shipping. The results are shown below in the following table: Satisfaction level Frequencyoste High Medium Low TOTAL 5 per month 100 TOTAL 460 220 20 700 A customer is chosen at random. Given that the customer uses the company two to five times per month, what is the probability that the customer expressed low satisfaction with the company