Christina has 50 pennies. Every day, she gives Marcus a penny. The number of pennies Marcus has is represented by the function y=x+50 , where x represents the number of days a penny is exchanged. Once you determine Christina's function using the same x , how would you compare both functions?

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