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January 29, 2015

January 29, 2015

Posted by **Tom** on Saturday, March 13, 2010 at 8:46pm.

a) What sample size should be used.

b) Repeat part (a) with a standard deviation of 50.

c) Repeat part (a) using a 95% confidence level.

d) Repeat part (a) when we wish to estimate the population mean to within 10 units.

- statistics -
**MathGuru**, Monday, March 15, 2010 at 7:12pmFormula:

n = [(z-value * sd)/E]^2

...where n = sample size, use a z-table to represent the 99% confidence interval, sd = 250, E = 50, ^2 means squared, and * means to multiply.

Plug the values into the formula and finish the calculation. Round your answer to the next highest whole number.

For b), use 50 for sd.

For c), use 95% interval.

For d), use 10 for E.

I hope this will help get you started.

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