To estimate the failure rate of a brand of VCR, 10 systems
Chapter , Problem 6.61(choose chapter or problem)
To estimate the failure rate of a brand of VCR, 10 systems are tested to failure. The average life and standard deviation are calculated to be 1500 h and 150 h, respectively. (a) Estimate the 95% confidence interval on the mean of the life of these systems. (b) How many of the systems should be tested to obtain a 95 % confidence interval on the mean of50h?
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