The Rockwell hardness index for steel is determined by pressing a diamond point into the steel and measuring the depth of penetr

Question

2 years ago

15

The Rockwell hardness index for steel is determined by pressing a diamond point into the steel and measuring the depth of penetr

ation. For 50 specimens of an alloy of steel, the Rockwell hardness index averaged 62 with standard deviation 8. The manufacturer claims that this alloy has an average hardness index of at least 64. Is there sufficient evidence to refute the manufacturer’s claim at the 1% significance level?

Mathematics

1 answer:

Rudik [331] · Answer 1 · 2022-05-07T22:22:45+03:00

Rudik [331]2 years ago

8 0

Does it say anything about carbon?