The mean for the standard normal distribution is zero, and the standard deviation is one.
For example, if the mean of a normal distribution is five and the standard deviation is two, the value 11 is three standard deviations above (or to the right of) the mean. A z-score is measured in units of the standard deviation. StatCrunch: Stat menu, Calculators, Normal, enter inequality symbol and z-score, Compute TI-83/84: 2nd VARS normalcdf ( -1000000000 Comma 1. The standard normal distribution is a normal distribution of standardized values called z-scores. That means the z-score were looking for is negative. What do the z scores imply If a score is greater. Notice the indicated z-score lies to the left of 0. For this example, your score is 1.7391 standard deviations above the mean. distribution Standard deviation of the distribution 3 Standardize a and or b to a z -score using the z -formula Look up the z -score on the Z -table see. So here in StatCrunch, I go to Stat > Calculators. You can use the z-score tables if you want you’ve got the links here to that in your problem but I find its much easier to just use StatCrunch. If the test has a mean () of 45 and a standard deviation () of 23, what’s your z score X 85, 45, 23. To get the P-value, I’m going to go back to StatCrunch and call up the Normal calculator.
