Z Score Chart Z Score Chart Use this chart to find the area under a normal curve when finding An approximation for a binomial distribution. Negative z-score - value is to the left of the mean. Positive z-score - value is to the right of the mean. Negative Z Scores Chart, Normal Distribution Table The chart shows the values of negative z scores which is either to the left or below the mean value. The whole number and the first digit after the decimal point of the z score is displayed in the row and the second digit in the column of the normal distribution table. Standard Normal Distribution Table The table below can be used to find the area under the curve from the central line to any "Z-score" value up to 3, in steps of 0.01. Know More About Stem and Leaf Plot
This will then tell you what portion of the population are within "Z" standard deviations of the mean. Instead of one LONG table, we have put the "0.1"s running down, then the "0.01"s running along. For example, to find the area under the curve between 0 and 0.45, start at the row for 0.4, and read along until 0.45: there is the value 0.1736 Because the curve is symmetrical, the same table can be used for values going either direction, so a negative 0.45 also has an area of 0.1736 To find the area between two negative z scores is, by symmetry of the bell curve, equivalent to finding the area between the corresponding positive z scores. Use the standard normal distribution table to look up the areas that go with the two corresponding positive z scores. Next subtract the smaller area from the larger area. For example, finding the area between z1 = -2.13 and z2 = -.45, is the same as finding the area between z1* = .45 and z2* = 2.13. From the standard normal table we know that the area associated with z1* = .45 is .674. The area associated with z2* = 2.13 is .983. The desired area is the difference of these two areas from the table: .983 - .674 = .309. Learn More About Calculating Standard Deviation
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