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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

Need same math paper but the back now i hope your able to read it cleary i need with hw

I’m really confused and need your assist me with this question i’ve never been taught