*An electrical firm manufactures light bulbs that have a lifetime that is approximately normallydistributed with a mean of 800 hours and a standard deviation of 40 hours X~N(u= 800, o =40)Test the hypothesis that Ho: µ = 800 hours against the alternative, H1:H # 800 hours, if arandom sample of n = 40 bulbs has an average life of x = 788 hours. Obtain the confidenceinterval. a = 0.0118. . Write the calculated value.19. Write the table value.20. Decision criteria:21. Decision: Ho22. Two sided confidence interval :P(....<µ< …) = 0.99

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* An electrical firm manufactures light bulbs that have a lifetime that is approximately normally distributed with a mean of 800 hours and a standard deviation of 40 hours X~N(µ= 800, o = 40) Test the hypothesis that Ho: u = 800 hours against the alternative, H1:µ # 800 hours, if a random sample of n = 40 bulbs has an average life of = 788 hours. Obtain the confidence interval. a = 0.01 18.. Write the calculated value. 19. Write the table value. 20. Decision criteria:

* An electrical firm manufactures light bulbs that have a lifetime that is approximately normally distributed with a mean of 800 hours and a standard deviation of 40 hours X~N(µ= 800, o = 40) Test the hypothesis that Ho: u = 800 hours against the alternative, H1:µ # 800 hours, if a random sample of n = 40 bulbs has an average life of = 788 hours. Obtain the confidence interval. a = 0.01 18.. Write the calculated value. 19. Write the table value. 20. Decision criteria:

A First Course in Probability (10th Edition)

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Author:Sheldon Ross

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Chapter1: Combinatorial Analysis

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Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

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Question

*An electrical firm manufactures light bulbs that have a lifetime that is approximately normally
distributed with a mean of 800 hours and a standard deviation of 40 hours X~N(u= 800, o =
40)
Test the hypothesis that Ho: µ = 800 hours against the alternative, H1:H # 800 hours, if a
random sample of n = 40 bulbs has an average life of x = 788 hours. Obtain the confidence
interval. a = 0.01
18. . Write the calculated value.
19. Write the table value.
20. Decision criteria:
21. Decision: Ho
22. Two sided confidence interval :
P(....<µ< …) = 0.99

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