Javier says that when you add a positive and a negative number, the sum is always negative. Is Javier's statement true or false? Explain your reasoning.
Hint: Try making an equation that is true and one that is
false.

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