(Answered) 1 a company manufactures batteries for watches a random

Statistics

1) A company manufactures batteries for watches. A random sample of 144 batteries is taken and the sample mean life is 5.5 years with a standard deviation of 0.6 years. If you were constructing a 99% two-sided confidence interval estimate, the lower limit would be:

2) A company wishes to determine if the average salary of its clerks is really $340. The company researcher takes a sample of 64 clerks and finds that X =$300 and s = $80.

a) Test at α = 0.05.

b) Construct a 95% CIE of μ

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