You work at an automobile engine assembly plant. One of the parts, a camshaft, must be 600 mm +2 mm long to meet engineering specifications.
There has been a chronic problem with camshaft length being out of specification, which causes poor-fitting assemblies, resulting in high scrap and rework rates.
Your supervisor wants to run X-bar and R charts to monitor this characteristic, so for a month, you collect a total of 100 observations (20 samples of 5 camshafts each) from all the camshafts used at the plant, and 100 observations from each of your suppliers. First you will look at camshafts produced by Supplier 2.

Second, suggest a supplier to your supervisor and

Third, what are your observations about the camshaft used in the shop this month.

Length	Supp1	Supp2
601.4	598.0	601.6
601.6	599.8	600.4
598.0	600.0	598.4
601.4	599.8	600.0
599.4	600.0	596.8
600.0	600.0	602.8
600.2	598.8	600.8
601.2	598.2	603.6
598.4	599.4	604.2
599.0	599.6	602.4
601.2	599.4	598.4
601.0	599.4	599.6
600.8	600.0	603.4
597.6	598.8	600.6
601.6	599.2	598.4
599.4	599.4	598.2
601.2	599.6	602.0
598.4	599.0	599.4
599.2	599.2	599.4
598.8	600.6	600.8
601.4	598.8	600.8
599.0	598.8	598.6
601.0	599.8	600.0
601.6	599.2	600.4
601.4	599.4	600.8
601.4	600.0	600.8
598.8	600.2	597.2
601.4	600.2	600.4
598.4	599.6	599.8
601.6	599.0	596.4
598.8	599.0	600.4
601.2	599.8	598.2
599.6	600.8	598.6
601.2	598.8	599.6
598.2	598.2	599.0
598.8	600.0	598.2
597.8	599.2	599.4
598.2	599.8	599.4
598.2	601.2	600.2
598.2	600.4	599.0
601.2	600.2	599.4
600.0	599.6	598.0
598.8	599.6	597.6
599.4	599.6	598.0
597.2	600.2	597.6
600.8	599.2	601.2
600.6	599.0	599.0
599.6	599.6	600.4
599.4	600.4	600.6
598.0	600.0	599.0
600.8	599.0	602.2
597.8	599.6	599.8
599.2	599.4	599.8
599.2	599.2	601.0
600.6	597.8	601.6
598.0	600.4	601.6
598.0	599.6	600.2
598.8	600.0	601.8
601.0	600.8	601.2
600.8	600.4	597.6
598.8	599.4	599.8
599.4	599.0	602.8
601.0	598.4	600.0
598.8	599.0	599.6
599.6	599.6	602.2
599.0	598.8	603.8
600.4	599.2	603.6
598.4	599.6	601.8
602.2	598.6	602.0
601.0	599.8	603.6
601.4	599.6	600.8
601.0	599.2	600.2
601.2	599.6	600.4
601.4	600.2	600.2
601.8	599.8	602.2
601.6	599.6	598.0
601.0	600.0	598.4
600.2	599.6	600.8
599.0	599.2	602.8
601.2	598.6	597.6
601.2	599.6	601.6
601.2	601.2	603.4
601.2	599.6	597.0
601.0	600.2	599.8
601.0	600.0	597.8
601.4	600.0	602.4
601.4	599.4	602.2
598.8	599.8	600.6
598.8	599.2	596.2
598.8	599.6	602.4
598.2	599.4	601.4
601.8	600.0	599.2
601.0	600.0	601.6
601.4	599.2	600.4
601.4	599.4	598.0
599.0	599.6	601.2
601.4	599.8	604.2
601.8	599.0	600.2
601.6	599.6	600.0
601.2	599.4	596.8