A new operator did not understand his job within manufacturing. The first day of employment, he made more mistakes than other operators who performed a similar task. Describe the type of cause for...

A new operator did not understand his job within manufacturing. The first day of employment, he made more mistakes than other operators who performed a similar task. Describe the type of cause for recent problems within this process.

For the data set shown in Exercise 10.17, determine the overall sample mean and standard deviation. Determine also the sample mean and standard deviation for each of the machines (see Example 19.12 for a compiling of the data by machine). Comment on results.