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Given a (1- ∝)% confidence interval for population mean; μ is [54.15 , 56.25]. Find the...

Given a (1- ∝)% confidence interval for population mean; μ is [54.15 , 56.25].

Find the value of: (a) the unbiased point estimator; ( sample mean; ⨰ ) for the population mean.

(b) the margin of error, E.

(c) Hence, if population standard deviation; σ = 3.5 and the number of samples; n =74, find the significance level α correct to 2 decimal places. [6 M]

Math   Statistics-And-Probability   
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