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Point Estimation and Confindence Intervals of Quartiles

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The following data are the lifetimes (in hours) of 20 certain electrical components:
6278 3113 9350 5236 11584
12628 7725 8604 14266 6215
3212 9003 3523 12888 9460
13431 17809 2812 11825 2398

Find a point estimate and 90% confidence interval for the population lower quartile.

Can you explain how and why we do the following problem?

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Solution Summary

Point estimation and confidence intervals of quartiles are investigated.

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