For example, a standard deviation of 2 indicates the value is 2 standard deviations away from the mean.
Z statistic chart. The individual value we’re interested in is x = 75. In hypothesis testing, the z critical value divides. The mean is μ = 80.
Table entries for z define the area under the standard normal. P (body) + p (tail) = 1.00. For instance to find the values of n (0.46), 1st locate the row of 0.4 and then, locate the 0.06 column.
Where the row and column intersect is. The standard deviation is σ = 4. You can use this positive z score table to find the values that are right of the mean.
Z test statistics is calculated using the formula given below.