Question

A yo-yo company wants to boast that after 1 million throws, the strings on their yo-yos still won't break. Someone in charge decides they should test the durability of their strings first so they get sued. They manufacture yo-yoing robots and randomly select 300 yo-yos to be tested. The results show an average of 999,986 throws before breaking some of the population standard deviation is 247 throws, you say hypothesis test at 99% confidence to see if the company will be safe in making this claim.

Answer 1

So clearly 1 million or 1000000 is included in the interval. So we can support the claim at 1% level of significance.