Z test

Perform a Z Test Use Table B-1 to determine significance X -H Z= spy where X - the mean of the sample; p = population mean; and SEM is the Standard Error of the Mean SEM= -, where o = standard deviation for the population and n = size of sample. X - H d = where d = Effect Size; again X = the sample mean; = the population mean; and o = the population standard deviation. After you have determined Z, use Table B-1 in the textbook to determine whether it meets the cutoff level for significance (more than 1.96 .or , in other words leaving 5% or less of the area under the normal curve outside the boundaries, 2.5% in each direction.) Then calculate the effect size to determine whether a significant result is also meaningful. Group Size Mean Standard Deviation Sample 20 90 4 Population 1000 80 4-8. SEM Z= Significant: Y or N Effect Size Meaningful: Y or N