What type of inference test should be used in this problem? How much longer do incandescent light bulbs last compared to fluorescent bulbs? 55 incandescent bulbs and 45 fluorescent bulbs were observed.
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An experiment compared the lifespan of two types of light bulbs: HotLight bulbs and BrightBulb. Twelve bulbs of each type were tested until failure, and the results in hours are shown in the two tables below: HotLight Bulb A: 1326 1249 1080 906 909 1479 1143 1385 1416 1066 994 1240 BrightBulb Bulb B: 960 915 1310 1521 1215 1044 1477 1104 1105 1476 1084 1249 What type of bulb lasted longer?
Sanchit J.
The following boxplots display data on lightbulb lifetimes for three brands (A, B, and C). a. Which brand is most predictable? b. Which brand tends to last longest? d. About 25% of Brand C bulbs last longer than what value? e. About 75% of Brand C bulbs last longer than what value? f. About 75% of Brand C bulbs last less than what value? g. About 50% of Brand C bulbs last longer than what value? j. About _______% of Brand A lasted longer than 70 hours. l. About _______% of Brand A lasted longer than 125 hours.
Rabia S.
A bulb manufacturer claims that brand A bulbs last longer than brand B bulbs. To test this claim, the life of both brands of bulbs, per hour, were recorded: $$\begin{array}{l|cccccc}\text { Brand A } & 810 & 850 & 760 & 690 & 820 & 830 \\\hline \text { Brand B } & 765 & 720 & 700 & & &\end{array}$$ Use the rank-sum test with $\alpha=0.05$ to test whether the claim is valid.
Nonparametric Statistics
Kruskal-Wallis Test
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