Question
A rechargeable flashlight is advertised to last up to 2 1/2 hours per charge and to...
A rechargeable flashlight is advertised to last up to 2 1/2 hours per charge and to recharge overnight. A test was conducted which measured the time a light lasted before needing a recharge. A random sample of 12 lights has a mean recharge time of 2.13 hours and a standard deviation of 1.06 hours. What is the 99% confidence interval estimate for the population mean?
Answers
Solution' 91Ue n that, X- 2-13 At.qq10-Con4ǐclence. _level-, - C. 2 At.91 26,--confidence interval is, 2-13-09us 2-13+0-79 C. 34, 2.92) The Con4ldence Ioterval estimate or the population Mean is- 一一-4 t 34,2 42
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