A production manager is interested in the number of defects in batches derived from different production processes. He examines a random sample drawn from each process and records the following data:

Test, at the 1 % level of significance, the hypothesis that the mean difference in number of defects between the two production processes is not significant.

Transcribed Image Text:

Process A B Mean defects 221 300 Standard deviation 25 80 Size of sample 90 110