An industrial engineer wants to test the effect of three different ways of assembling a part on the total assembly time.Five people are randomly assigned to each of the three assembly methods,and the total assembly time (in seconds)is recorded.The box plots for the three methods are shown below.
A)Yes,all the groups look like they are normally distributed.
B)Yes,the spreads look similar enough to proceed with the ANOVA.
C)No,the spreads of the three groups look different.The response may need to be re-expressed before proceeding with the ANOVA.
D)No,the centre line for method one is lower than the lines for methods two and three.
E)Yes,the widths of the boxes are all the same.

Question

An industrial engineer wants to test the effect of three different ways of assembling a part on the total assembly time.Five people are randomly assigned to each of the three assembly methods,and the total assembly time (in seconds)is recorded.The box plots for the three methods are shown below. 
A)Yes,all the groups look like they are normally distributed. 
B)Yes,the spreads look similar enough to proceed with the ANOVA. 
C)No,the spreads of the three groups look different.The response may need to be re-expressed before proceeding with the ANOVA. 
D)No,the centre line for method one is lower than the lines for methods two and three. 
E)Yes,the widths of the boxes are all the same.

Quizplus · Accepted Answer

The spreads of the three groups look different, which may violate the assumption of homogeneity of variances. Therefore, the response may need to be re-expressed before proceeding with the ANOVA.

An Industrial Engineer Wants to Test the Effect of Three