I have my end of year exams next Thursday. I'm generally doing fine but I am having some major issues with this strand of my course, this has to be the biggest issue I have. So, here is the question in the past paper:
You have been tasked with determining the validity of a manufacturer’s claim that their widget is more reliable than their main competitors’ widgets.
In order to verify this assertion you test a sample of 25 widgets from the manufacturer’s range and find a mean pass rate of 992 per 1000 with a standard deviation of 15 per 1000.
Previous studies have shown that the mean pass rate of all other widgets on the market is 979.4 per1000.
In order to increase the confidence in the making a decision about the null hypothesis you choose a 99.5% confidence level and find the corresponding t-table value to be 2.947.
- State the null hypothesis.
I have revision notes in front of me, but I just don't understand what this question is actually asking. Am I just writing down my own hypothesis, or do I need to use this equation?
If anyone could go through step by step for what I need to do, then that would be fantastic. My notes are just confusing!