PLEASE SHOW EXCEL FORMULA
normal population has parameters μ = 40 and σ = 8.
Sample mean = μ = 40
standard error = σ / sqrt(n) = 8/sqrt(64) = 8/8 = 1
Construct a ninety percent the confidence interval of the sample mean for a sample size n = 1,000.
Obtain critical value using =NORM.S.INV(0.05) ( as it is two tailed )
z_c = 1.645
The corresponding confidence interval is computed as shown below:
CI = (39.584, 40.416)
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