1) A random sample of 45 restaurants gave a mean profit per employee of €350. The population standard deviation is known and its value is €55. Find the 95% confidence interval for the mean profit per employee for all restaurants.

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1) A random sample of 45 restaurants gave a mean profit per employee of €350. The
population standard deviation is known and its value is €55. Find the 95%
confidence interval for the mean profit per employee for all restaurants.
2) A power company is promoting high-efficiency bulbs by giving a rebate to all buyers
of such bulbs. The service desk manager knows that the employee time required to
process such a rebate follows the normal distribution. The manager monitored a
random sample of 16 rebate processes and measured the employee time spent for
each. The sample mean was 3.7 minutes and the sample standard deviation was 1.7
minutes. Compute the 99% confidence interval for the mean employee time required
to process all of these rebates
Transcribed Image Text:1) A random sample of 45 restaurants gave a mean profit per employee of €350. The population standard deviation is known and its value is €55. Find the 95% confidence interval for the mean profit per employee for all restaurants. 2) A power company is promoting high-efficiency bulbs by giving a rebate to all buyers of such bulbs. The service desk manager knows that the employee time required to process such a rebate follows the normal distribution. The manager monitored a random sample of 16 rebate processes and measured the employee time spent for each. The sample mean was 3.7 minutes and the sample standard deviation was 1.7 minutes. Compute the 99% confidence interval for the mean employee time required to process all of these rebates
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