The perimeter of the rectangular base of a monument is 210.5 feet. if the width is equal to its length, what are the dimensions of the base?

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