Statistical Quality Control (L.Q.3)The expected cost to produce a batch of compact discs at Laser Audio is $17.200. The standard deviation for the cost is $450 per batch. Eight batches of compact discs were produced in the current week. The cost for each batch is as follows:

Laser Audio uses a two-standard deviation quality control limit.

Required:

Which of the eight batches should be investigated? For each batch that should be investigated, state the reason for the investigation.

Transcribed Image Text:

Batch Cost Rock $16,218 Roll 17,918 Classical 16,444 Country 18,283 Oldies 17,391 Heavy metal 18,090 Punk 15,899 New age 18.004