Asked by Courtney
suppose you wish to estimate a population mean based on a random sample of n observations, and prior experience suggests that sd=12.7. if you wish to estimate the mean correct to within 1.6, with probability equal to .95, how many observations should be included in your sample?
Answers
Answered by
MathGuru
Formula:
n = [(z-value * sd)/E]^2
...where n = sample size, z-value will be 1.96 using a z-table to represent the 95% confidence interval, sd = 12.7, E = 1.6, ^2 means squared, and * means to multiply.
I'll let you take it from here.
n = [(z-value * sd)/E]^2
...where n = sample size, z-value will be 1.96 using a z-table to represent the 95% confidence interval, sd = 12.7, E = 1.6, ^2 means squared, and * means to multiply.
I'll let you take it from here.
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