A math class is having a discussion to determine if the expressions 4X minus X +5 and eight minus 3X -3 or equivalent using subsition The class has suggested for different methods

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