2 - A researcher thinks that life time of light bulb has a normal distribution with mean of 3000 hours and variance of 50 hours. In order to construct 80 % confidence interval for the mean life time...

2 -<br>A researcher thinks that life time of light bulb has a normal distribution with mean of 3000 hours and variance of 50<br>hours. In order to construct 80 % confidence interval for the mean life time of light bulb randomly selected 36<br>sample light bulbs mean value is 2850 hours and standard deviation is 25 hours. Find the confidence interval. (use 2<br>decimal point)<br>a)<br>None of them correct<br>831<br>b)<br>2848.49 , 2851.51<br>c)<br>2839.32 , 2860.68<br>d)<br>2840.32 , 2859.68<br>e)<br>2844.66 , 2855.34<br>

Extracted text: 2 - A researcher thinks that life time of light bulb has a normal distribution with mean of 3000 hours and variance of 50 hours. In order to construct 80 % confidence interval for the mean life time of light bulb randomly selected 36 sample light bulbs mean value is 2850 hours and standard deviation is 25 hours. Find the confidence interval. (use 2 decimal point) a) None of them correct 831 b) 2848.49 , 2851.51 c) 2839.32 , 2860.68 d) 2840.32 , 2859.68 e) 2844.66 , 2855.34

Jun 05, 2022

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2 - A researcher thinks that life time of light bulb has a normal distribution with mean of 3000 hours and variance of 50 hours. In order to construct 80 % confidence interval for the mean life time...

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