Quiz 2 STA201 Fall 17 Key.pdf - "U Ivo.~!E:5 j SEAT NUMBER...

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Unformatted text preview: “"U"’ Ivo- .\‘.~\.\!E: [:5 ‘j; SEAT NUMBER: Demmnent ot‘.\l:1thentaties and Statistics QUEZ #2 SPA :01 September 20, 2017 Qlll3 Pts] Consider the following sample data: 2. 8, 8, 13, 15, 20 (at Find the mean. median and the mode. S": (2—*$-c‘-§'-H3+— I! eta/5’ :@ mm»: S‘-H3 .5. WE ’L “.1796. 56‘?- S {N Replace the maximum value of the data set with the value 50. How does this change affect the mean? The median? 5;": 71/5 ’5.- ““7: Ih(p;o'u ‘S‘lfl-J‘! M 0119.31 te) Calculate the \mianu‘ and the standard deflation for the data set in (a). _._ ,L [Haw—Ull- QZI? Pts]. Consider the following box plots which represent the lifetime distribution of three brands of lightbulbs. Answer the following questions: Lightbulb Lifetimes Brand A Brand B Brand (3 7U 30 90 100 110 120 130 140 150 Lifetimes (in 1008 of hours) a. What is the shape of the distribution of Brand A? Mi 9““ “Q m‘C— b. What is the shape of the distribution of Brand B. lap/‘7} ' 'ng mm c. Which brand has the lowest median? [Lg/Imp C ' (1. Which brand has the largest spread? fl V“"V€ & " e. What is the maximum value for brand C? q 0 f. The value of Q3 for Brand B is 137.75. Approximately, what percentage of Brand B bulbs lasted more than 137.75 hours? 95 % g. Which brand has outlier/s? [L {an 0 C . ...
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