Let 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 of $8 46 to $9 86 using the normal distribution with a known population standard deviation a Find the value of x for this sample b Find a 99 confidence interval for based on this sample

Question: Let be the hourly wage (excluding tips) for workers who provide hotel room service in a large city. A random sample of a number

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 x̅ for this sample.

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

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