QUESTION #8:

Joeys Salsa Company is considering using a new container for its salsa. According to their research, the glass containers for the salsa should have a strength between LSL = 185 psi and USL = 325 psi. Joeys vendor has provided the following data for evaluation.

Sample			Data
1	265	205	263	307	220
2	268	260	234	299	215
3	197	286	274	243	231
4	267	281	265	214	318
5	346	317	242	258	276
6	300	208	187	264	271
7	280	242	260	321	228
8	250	299	258	267	293
9	265	254	281	294	223
10	260	308	235	283	277
11	200	235	246	328	296
12	276	264	269	235	290
13	221	176	248	263	231
14	334	280	265	272	283
15	265	262	271	245	301
16	280	274	253	287	258
17	261	248	260	274	337
18	250	278	254	274	275
19	278	250	265	270	298
20	257	210	280	269	251

1. Establish X and R charts (i.e. calculate the control limits) for (breaking) strength quality characteristic and draw the control charts. Is there evidence that the process is in control?
2. Estimate the process average and process standard deviation .
3. Is the process capable of producing jars with a breaking strength between 185 and 325 psi? In other words, calculate the potential capability of the process Cp and the actual process capabilities Cpu, Cpl and Cpk. Comment on the results.