Which compound inequality has no solution? x > 2 and 3x ≤ 9
x > 1 and 2x ≤ –2
x > –1 and 4x ≥ –8
x > –2 and 5x ≥ 15

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