12. An employer wishes to estimate the mean amount that their 800 employees are spending on health care that is not covered by insurance. A sample of 49 employees are selected and interviewed. The mean of the sample was $1,280 with a standard deviation of $150. Construct a 95% confidence interval for the mean of the population.

13. Williams Grove Raceway wishes to estimate the mean amount of concessions that they sell to their 1,000 season ticket holders on a Friday night. A sample of 64 season ticket holders spent a mean of $24 with a standard deviation of $6. Construct a 99% confidence interval for the mean amount of concessions.

12. An employer wishes to estimate the mean amount that their 800employees are spending on health care that is not covered by insurance. A sample of 49 employees are selected and interviewed. The mean of the sample was $1,280 with a standard deviation of $150. Construct a 95% confidence interval for the mean of the population. 13. Williams Grove Raceway wishes to estimate the mean amount of concessions that they sell to their 1,000 season ticket holders on a Friday night. A sample of 64 season ticket holders spent a mean of $24 with a standard deviation of $6. Construct a 99% confidence interval for the mean amount of concessions