At an assembly plant for light trucks, routine monitoring of the quality of welds yields the following data: Number of Welds High Quality Moderate Low Quality Quality Day Shift Evening Shift 467 191 42 445 171 34 Night Shift 254 129 17 Can you conclude that the quality varies among shifts? State the appropriate null hypothesis. Compute the expected values under the null hypothesis. a. b. Compute the value of the chi-square statistic. Find the P-value. What do you conclude? C. d.

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