Question

Please solve manually because I do not understand when solving use excel.

A quality control analyst for a lightbulb manufacturer is concerned that the time it takes to produce a batch of lightbulbs is too erratic. Accordingly, the analyst randomly surveys 5 production periods each day for 8 days and records the sample mean and range for each da DAY 2 14.3 3 15.3 5.0 4 12.6 2.8 5 11.8 3.7 TOTAL 113.6 30.8 X-bar 13.6 3.5 12.9 4.8 17.3 4.5 15.8 2.4 Range Compute for the 1. x-bar [al] 2. Upper control limit of X chart [b] 3. Lower control limit of X chart [c] 4. r bar [d] 5. Upper control limit of R chart [e] 6. Lower control limit of R chart [f]

Answer 1

Hean for X 113.6 1.2 UCL,' 15.64 (b) -3.rs | →비 S UCL UCIR Dt R = 1.864 x 3.85 Dt and D from able