Needed ! will give 28

the two-way table shows the number of students in a school who bring their lunch and/or who ride the bus:

bring lunch do not bring lunch total
ride bus 40 35 75

do not ride bus 55 2 57

total 95 37 132

how many more bring lunch than ride the bus?
25
20
7
3

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