The advertised weight of frozen food packages is 16 (oz) and the specifications are 16 ± 0.3 oz. Random samples are of size 8 are selected from the output and weighted. The sample mean and standard deviation are calculated. Information on 25 such samples yields the following

(a) Determine the centerlines and control limits for the - and s-charts.
(b) Estimate the process mean and standard deviation, assuming that the process is in control.
(c) Find the 1ó and 2ó control limits for each chart.
(d) What proportion of the output is nonconforming? Is the process capable?
(e) What proportion of the output weighs less than the advertised weight?
(f) If the manufacturer is interested in reducing potential complaints and lawsuits from customers who feel that they have been cheated by packages weighing less than what is advertised, what action should the manufacturer take?

Transcribed Image Text:

Σκ-398 Σ Si = 3.00