Question

A production manager tests 10 toothbrushes and finds that their mean lifetime is 450 hours. She then designs a sales package for this type of bulb stating that consumers can expect it to last approximately 460 hours. This is an example of what phase of inferential statistics?

A. Data gathering
B. Data organization
C.Probability-based inference
D. Data analysis

Answer 1

is it D?

Answer 2

no its C