The manufacturer of LED lights would like to include as part of their advertising the number of hours an LED is expected to work. A sample of 20 lights revealed the following number of hours worked.   2698    2628    2474    2895    2672    2675    2486    2852            2733    2655 2765    2794    2486    2627    2624    2785    2692    2654            2518    2650   Draw normal probability plot for the above data and make comment. Assuming given data to be approximately normally distributed, Construct 90%, 95% and 99% confidence intervals for the mean number of hours that the LED lights of this brand has worked. Construct 90%, 95% and 99% confidence intervals for the standard deviation of the number of hours that the LED lights of this brand worked.

MATLAB: An Introduction with Applications
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Author:Amos Gilat
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  1. The manufacturer of LED lights would like to include as part of their advertising the number of hours an LED is expected to work. A sample of 20 lights revealed the following number of hours worked.

 

2698    2628    2474    2895    2672    2675    2486    2852            2733    2655

2765    2794    2486    2627    2624    2785    2692    2654            2518    2650

 

  1. Draw normal probability plot for the above data and make comment.
  2. Assuming given data to be approximately normally distributed, Construct 90%, 95% and 99% confidence intervals for the mean number of hours that the LED lights of this brand has worked.
  3. Construct 90%, 95% and 99% confidence intervals for the standard deviation of the number of hours that the LED lights of this brand worked.
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