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  3. (please, since the very beginning, all the one by

(PLEASE, SINCE THE VERY BEGINNING, ALL THE ONE BY ONE STEPS NEED TO BE MENTIONED IN...

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Basic Math

(PLEASE, SINCE THE VERY BEGINNING, ALL THE ONE BY ONE STEPS NEEDTO BE MENTIONED IN YOUR CALCULATION) A manufacturer of cell phonesguarantees that his cell phones will last, on average, 3 years witha standard deviation of 1 year. If 5 of those cell phones are foundto have lifetimes of 1.9, 2.4, 3.0, 3.5 and 4.2 years, can themanufacturer still be convinced that his cell phones have astandard deviation of 1 year? Test at a 0.05 level of confidence.Thank you in advance for your help!

Answer & Explanation Solved by verified expert
3.6 Ratings (399 Votes)
First we calculate the standard deviation for the sampleStandard deviation SqrtVariance whereVariance Sum of Squares 1 Sum X Mean21XMeanx    See Answer
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