What sample size is required for a maximum error of estimation of 10 for a population whose standard deviation is 40 using a confidence interval of 0.95? How much larger must the sample size be if the maximum error is to be 5?
The following sample was taken from a normally distributed population with a known standard deviation σ 5 4. Test the hypothesis that the mean μ = 20 using a level of significance of 0.05 and the alternative that μ 20:
23; 32; 22; 31; 27; 25; 21; 24; 20; 18:
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