The question is as follows:
A manufacturer of floor mops wants his product to last an average of 700 hours. He wants a mean not a lot less than 700 and not a lot more than 700 hours. The manufacturer has reason to believe the mean may have changed. Random sample of 48 items shows x bar = 675 and s = 77 hours.
Complete the test at 5% level of significance. I did that. I get t=60.75 and a u (mu?) = 1.0.
The next question asks, what type of error has been made. Why? And then what the probability of making that error is. Can anyone help? :?
A manufacturer of floor mops wants his product to last an average of 700 hours. He wants a mean not a lot less than 700 and not a lot more than 700 hours. The manufacturer has reason to believe the mean may have changed. Random sample of 48 items shows x bar = 675 and s = 77 hours.
Complete the test at 5% level of significance. I did that. I get t=60.75 and a u (mu?) = 1.0.
The next question asks, what type of error has been made. Why? And then what the probability of making that error is. Can anyone help? :?