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the employees of cybertronics, inc. need to complete a certification online. a random sample of 49...

the employees of cybertronics, inc. need to complete a certification online. a random sample of 49 employees gives an average time for completion of all coursework and passing the tests of 6 hours. assume the population standard deviation is 6 hours and the sample standard deviation is 6 hours. assume that the population standard deviation is 6 hours and the population of employees is fairly large. construct a 95% confidence interval for the average time required to complete the certification.

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Answer #1

given data are:-

sample mean () = 6

population sd () = 6

sample size (n) = 49

z critical value for 95% confidence level,both tailed test be :-

the 95% confidence interval for the average time required to complete the certification be:-

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