8.2 Suppose average pizza delivery times are normally distributed with an unknown population mean and a population standard deviation of six minutes. A random sample of 28 pizza delivery restaurants is taken and has a sample mean delivery time of 36 minutes. Find a 90% confidence interval estimate for the population mean delivery time. Solution A Identify values to plug into the formula i +( Za Write solution first as ī ± EBM: Write solution in interval notation: Solution B Chock v our "by, band" work by rupping 7lntonal tort:

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8.2 Suppose average pizza delivery times are normally distributed with an unknown population mean and a population standard deviation of six minutes. A random sample of 28 pizza delivery restaurants is taken and has a sample mean delivery time of 36 minutes.

Find a 90% confidence interval estimate for the population mean delivery time.

Solution A

Identify values to plug into the formula \( \bar{x} \pm \left( z_{\frac{\alpha}{2}} \right) \left( \frac{\sigma}{\sqrt{n}} \right) \)

Write solution first as \( \bar{x} \pm EBM: \) _____________________________

Write solution in interval notation: ( ___________ , ___________ )

Solution B

Check your “by hand” work by running a ZInterval test:

Interpretation

__________________________________________________________________

__________________________________________________________________

__________________________________________________________________
Transcribed Image Text:8.2 Suppose average pizza delivery times are normally distributed with an unknown population mean and a population standard deviation of six minutes. A random sample of 28 pizza delivery restaurants is taken and has a sample mean delivery time of 36 minutes. Find a 90% confidence interval estimate for the population mean delivery time. Solution A Identify values to plug into the formula \( \bar{x} \pm \left( z_{\frac{\alpha}{2}} \right) \left( \frac{\sigma}{\sqrt{n}} \right) \) Write solution first as \( \bar{x} \pm EBM: \) _____________________________ Write solution in interval notation: ( ___________ , ___________ ) Solution B Check your “by hand” work by running a ZInterval test: Interpretation __________________________________________________________________ __________________________________________________________________ __________________________________________________________________
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