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1. Assume you're interested in estimating proportion of San Diegans between the ages of 18 and 40 who're able to purchase a home in the San Diego metropolitan area, where median home price just reached $716,000.  You would like to determine the proportion with 90% confidence and margin of error of 3%.  How many San Diegans between 18 and 40 years old would you need to randomly sample to determine this correctly?

2. The office manager for the large company is studying the usage of its copier machines. A random sample of six of its machines revealed following number of copies made in one day:  826   931   1,126   918   1,011 and 1,124.  Use this information to create a 95% confidence interval to estimate the true average number of copies made each day at this company.

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