# Question

Let µ be the hourly wage (excluding tips) for workers who provide hotel room service in a large city. A random sample of a number (more than 30) of such workers yielded a 95% confidence interval for µ of $8.46 to $9.86 using the normal distribution with a known population standard deviation.

a. Find the value of for this sample.

b. Find a 99% confidence interval for µ based on this sample.

a. Find the value of for this sample.

b. Find a 99% confidence interval for µ based on this sample.

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