Explain how you can tell the difference between the half inch and quarter inch marks when measuring an object with a ruler? well you ever have the same answer when measuring to the nearest half inch and measuring to the nearest quarter inch?

Aproduction manager test 10 toothbrushes and finds that their mean lifetime is 450 hours. she then design sales package of this type of toothbrush. it states that the customers can expect the toothbrush to last approximately 460 hours. this is an example of what phase of inferential statistics