Determine the minimum required sample size if you want to be 90% confident that the sample mean is within 4 un

0 ⤊

Determine the minimum required sample size if you want to be 90% confident that the sample mean is within 4 un

Determine the minimum required sample size if you want to be 90% confident that the sample mean is within 4 units of the population mean given sigma = 7.8. Assume the population is normally distributed

2007-12-20 15:00:21 · 1 answers · asked by john s 1 in Science & Mathematics ➔ Mathematics

1 answers

4/1.6449 = σ = 2.431759
n = 7.8^2/2.431759
n ≈ 10.288 rounded up = 11

2007-12-21 13:26:29 · answer #1 · answered by Helmut 7 · 0⤊ 0⤋