# Below are the lifetimes, in hours, of fty 40-watt,

## Problem 1.30 Chapter 1

Probability and Statistics for Engineering and the Sciences | 9th Edition

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Problem 1.30

Below are the lifetimes, in hours, of fty 40-watt, 110-volt internally frosted incandescent lamps, taken from forced life tests: 919 1196 785 1126 936 918 1156 920 948 1067 1092 1162 1170 929 950 905 972 1035 1045 855 1195 1195 1340 1122 938 970 1237 956 1102 1157 978 832 1009 1157 1151 1009 765 958 902 1022 1333 811 1217 1085 896 958 1311 1037 702 923 Construct a box plot for these data.

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Section 4: Statistics in Surveys and Polls Stat 2220, Espey ➢ Survey​: an important kind of observational study, a sample is gathered from the population ○ Polls​: a type of survey that is usually by phone or mail ○ Face to face surveys: ■ Expensive to pay for surveyors and their travel ■ Variable: are the surveyors...

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