Question

The manufacturer of television tubes knows from the past experience that the average life of tube is 2000 hrs with a s.d. of 200 hrs. A sample of 100 tubes has an average life of 1950 hrs, Test at the 0.01 level of significance to see if this sample came from a normal population of mean 2000 hrs

Answer 1

The manufacturer of television tubes knows from the past experience that the average life of tube is 2000 hour with a s.d. of 200 hrs. A sample of 100 tubes has an average life of 1950 hour , Test at the 0.01 level of significance to see if this sample came from a normal population of mean 2000