C. The Unit Normal Table Lists proportions of the normal distribution for a full range of possible z-scores (G&W p. 725-728). For any z-score value, the proportions in columns B and C will always add to 1.00. Distribution is symmetrical so the proportions on the right-hand side are exactly the same as the corresponding proportions on the left-hand side. Z-score values will change signs (+ and -) from one side tot he other, but the proportions will be the same and will always be positive. D. Answering questions with the unit normal table Sketch the distribution and shade in the area you are trying to determine. Look up the appropriate value of z in the unit normal table. Note: sometimes no column in the unit normal table directly gives the answer we need, so must do some math. What proportion of the normal distribution corresponds to the tail beyond z = -0.50? The proportion in the left tail beyond z = -0.50 is the same as the proportion in the right tail beyond z = +0.50. Look up z = .50 in column A, and find the proportion in tail (column C). p(z<-0.50) = .3085 or 30.85%
C. The Unit Normal Table Lists proportions of the normal distribution for a full range of possible z-scores (G&W p. 725-728). For any z-score value, the proportions in columns B and C will always add to 1.00. Distribution is symmetrical so the proportions on the right-hand side are exactly the same as the corresponding proportions on the left-hand side. Z-score values will change signs (+ and -) from one side tot he other, but the proportions will be the same and will always be positive. D. Answering questions with the unit normal table Sketch the distribution and shade in the area you are trying to determine. Look up the appropriate value of z in the unit normal table. Note: sometimes no column in the unit normal table directly gives the answer we need, so must do some math. What proportion of the normal distribution corresponds to the tail beyond z = -0.50? The proportion in the left tail beyond z = -0.50 is the same as the proportion in the right tail beyond z = +0.50. Look up z = .50 in column A, and find the proportion in tail (column C). p(z<-0.50) = .3085 or 30.85%
Probability%20F14%20GW6.docx