At an assembly plant for light trucks, routine monitoring of the quality of welds yields the following data: Number of Welds
High Quality Moderate Quality Low Quality
Day Shift 467 191 42
Evening Shift 445 171 34
Night Shift 254 129 17

Required:
a. State the appropriate null hypothesis.
b. Compute the expected values under the null hypothesis.
c. Compute the value of the chi-square statistic.
d. Find the P-value. What do you conclude?