Data

1. Specifications for a part for a DVD player state that the part should weigh between 24 and 25 ounces. The process that produces the parts has a mean of 24.5 ounces and a standard deviation of .2 ounce. The distribution of output is normal. a. What percentage of parts will not meet the weight specs? b. Within what values will 95.44 percent of sample means of this process fall, if samples of n = 16 are taken and the process is in control (random)? 8. Given the following data for the number of defects per spool of cable, using three-sigma limits, is the process in control? OBSERVATION Number of defects 1 2 3 4 5 6 7 8 9 10 11 12 13 2 3 1 0 1 3 2 0 2 1 3 1 2 14 0 9. After a number of complaints about its directory assistance, a telephone company examined sam-ples of calls to determine the frequency of wrong numbers given to callers. Each sample consisted of 100 calls. Determine 95 percent limits. Is the process stable (i.e., in control)? Explain. SAMPLE 1 2 3 4 5 6 7 8 9 Number of errors 5 3 5 7 4 6 8 4 5 10 11 12 13 14 15 16 9 3 4 5 6 6 7