T-Moble c @ 20% The operations manager of a company that manufactures tires want
ID: 3367978 • Letter: T
Question
T-Moble c @ 20% The operations manager of a company that manufactures tires wants to determine whether there are any differences in the quality of workmanship among the three daily shifts. She randomly selects 490 tires and carefully inspects them. Each tire is either classified as perfect, satisfactory, or defective, and the shift that produced it is also recorded. The two categorical variables of interest are: shift and condition of the tire produced. The data can be summarized by the Perfect Satisfactery Defective Total 151 Shift36 Tetal 210 A) This sample has degree of freedom: DF 4 If shift and quality are independent, then B) Accurate to 2 decimal places, the expected count in row I column I is C) Accurate to 2 decimal places, the componew alne in row I column 1 of the table is D) ?, value of this sample is E) At significance level 0.02, is the sample showing strong evidence that shift and quality are dependent? Use 4 decimal places for p-value O Yes No F) The p-valwe for this sample was: p-value 00 Message instructor about this qaestionExplanation / Answer
A) d.f. = (r-1)(s-1) = (3-1)(3-1) = 4
B) E11 = 98.67
C) 0.72
D) Chisquare value of the sample is = 12.1
E) YES ; P<0.01
F) P = 0.0166
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