WebA negative z-score means the data value is smaller than the mean. If a data value has a z-score of –3.1, then this data value is 3.1 standard deviations smaller than the mean. A z-score of zero means that the data value equals the mean. For example, consider a data set with a mean of 50 and a standard deviation of 2. WebZ-scores can be positive or negative. The sign tells you whether the observation is above or below the mean. For example, a z-score of +2 indicates that the data point falls two …

How to calculate probability with Z score not on table?

WebThe z-scores to the right of the mean are positive and the z-scores to the left of the mean are negative. If you look up the score in the z-table, you can tell what percentage of the population is above or below your score. The grades on a math midterm are normally distributed with mean of 67% and a standard deviation of 2.5. Greg scored a 70%. WebA negative Z score value indicates the raw score value is either left or below the mean of the standard normal distribution. The negative z score in the z-table represents the area … citric acid in eye

Z-Score Table Guide - [ Positive & Negative Z Score …

Web15 feb. 2024 · A negative z-score reveals the raw score is below the mean average. For example, if a z-score is equal to -2, it is 2 standard deviations below the mean. Another … WebThe probability is the area below the Normal distribution's curve. For a score of z = 3.16, the area under the Normal distribution from − ∞ σ to 3.16 σ is ≈ 1 (this is the probability). Note this an an estimate. There does … WebA negative Z score value indicates the raw score value is either left or below the mean of the standard normal distribution. The negative z score in the z-table represents the area under the bell curve to the left of z. If the z score value is negative, use the negative z table to find an area on the left of the mean of the distribution. dickinson county treasurer office