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Q1) ATM machine was installed at Hunter Industries for exclusive use of Hunter's employees.

Union Bank desired to evaluate percentage of all employees which used the machine at least twice in last month. From a arbitrarily chosen sample of 100 employees, 45 did use ATM at least twice. Use this information to make a 95% confidence interval evaluating percentage of all employees that use machine at least twice per month.

Q2) Assume you are interested in evaluating proportion of San Diegans between ages of 18 and 40 who are able to buy a home in San Diego metropolitan area, where median home price just reached $716,000. You would like to evaluate the proportion with 90% confidence and margin of error of 3%. How many San Diegans between 18 and 40 years old would you require to arbitrarily sample to evaluate this correctly?

Q3) Office manager for large company is studying usage of its copier machines. Random sample of 6 of its machines revealed the following number of copies made in one day: 826 931 1,126 918 1,011 and 1,124. Use this information to make a 95% confidence interval to evaluate true average number of copies made each day at this company.

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Category:- Statistics and Probability
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