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In the book Essentials of Marketing Research, William R. Dillon, Thomas J. Madden, and Neil A. Firtle discuss the relationship between delivery time and computer-assisted ordering. A sample of 40 firms shows that 16 use computer-assisted ordering. while 24 do not. Furthermore, post data are used to categorize each firm's delivery times as below the industry average, equal to the industry average, or above the industry average. The results obtained are given in the table below A Contingency Table Relating Delivery Time and Computer-Assisted Ordering B Click here for the Excel Data file (o) Test the hypothesis that delivery time performance is independent of whether computer-assisted ordering is used. What do you conclude by setting a=05 ? (b) Verify that a chi-square test is appropriate. (c) Is there a difference between delivery-time performance between firms using computer-assisted ordering and those not using computer-assisted ordering? \begin{tabular}{l|} \hline Yos \\ \hline No \\ \hline \end{tabular}