Select Analysis, Probability Distributions, Normal Distribution. Enter either the value of the z test statistic or enter the cumulative area to its left (such as 0.975). Click on Evaluate.Results include the value of z, and several different cumulative areas: Left: The cumulative area to the left of the z test statisticRight: The cumulative area to the right of the z test statistic2 Tailed: Twice the area of the tail region beyond the z test statisticCentral: The area between –z and zAs Table A-2: The cumulative area to the left of the test statistic z (the same format used in Table A-2 in the textbook)(The value given for “Prob Dens” (probability density) is the height of the graph of the normal distribution at the given value of z. This value is typically not used in the introductory statistics course.) |