The online clothing retailer e-Parel is conducting a study to estimate the average size of the orders placed by visitors to its website. The project manager desires a $60 bound on the error of estimation at 90% confidence. The population standard deviation is unknown, and a “best guess” of $175 is used as the planning value for σ. Use the Distributions tool to help you answer the questions that follow.   0123 Select a Distribution           The z-value for a 90% confidence interval of the population mean is    .   In order to satisfy the requirement of a $60 bound on the error of estimation, a sample size no smaller than    is needed.

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