Statistics Solutions

(See Solution) The plant manager of a company that manufactures office equipment is attempting to determine the process that will be used to assemble a

Question: The plant manager of a company that manufactures office equipment is attempting to determine the process that will be used to assemble a new ergonomic chair. There are two methods under consideration that differ by the order in which the separate operations are performed. The following table shows the assembly times in minutes that were recorded by randomly selecting 25 workers for each method.

Method A Method B
6.6 6.3
5.7 7.0
5.6 8.2
6.4 6.1
4.8 6.7
6.3 5.9
6.0 6.1
7.3 7.3
5.9 6.6
6.4 4.5
9.0 4.9
7.0 7.9
5.2 3.3
6.3 5.7
8.1 7.9
8.6 4.5
5.0 5.5
7.1 5.7
8.1 5.0
6.1 5.6
6.3 6.4
4.5 6.7
6.1 6.7
7.3 7.3
6.1 6.5
  1. Assuming the variances are equal, construct a 95% confidence interval on the difference in mean assembly times.
  2. Does the assumption of normality seem appropriate for these data?

Price: $2.99
Solution: The downloadable solution consists of 4 pages
Deliverable: Word Document


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