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The schools in Montreal wants to estimate family dental expenses of its employees. A random sample of 10 employees reveals the dental expenses in canadian dollars for last year.
710 1962 846 685 651 805 773 1025 916 1779 Ex=10,152 Ex^2= 12,262,362
- What is the 90% confidence interval for the average family dental expense for all employees in this company?
- What assumption must be made in the first question?
- If the company would like to reduce the margin of error by 50%, what sample size should it consider taking if it wants to estimate the true mean family dental expenses with 95% confidence?
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