A random sample of 100 batteries has a mean lifetime of 15 hours. Suppose the standard deviation for battery life in the population of all batteries is 2 hours. Give a 95% CI for the mean battery life a.)What are the Significance level and Type of test  b.)What is the Critical Value for Z (z-score)? c.)What is the upper  and lower confidence interval? d.)What is the result of the analysis?

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