The Probability between z SCORES calculator computes the area under the Normal Distribution curve between two z SCOREs.Probability & Normal Distribution This equates to the probability of an event in that range.
INSTRUCTIONS: Enter the following:
(z1) First z SCORE.
(z2) Second z SCORE.
Area Under the Normal Curve (P): The calculator returns the area under the Normal Distribution curve between the z SCOREs. This is equivalent to the probability of an event occurring between the z SCOREs. It ranges from 0.00001 to 0.99999.
The Math / Science
This z Score indicates the number of standard deviations an observation is above or below the mean. The equation for the z Score is:
Observational Stats: This function accepts a table of numbers separated by commas and calculates observational statistics for any of the columns. This includes count, min, max, sum, sum of squares (Σx²), square of the sum (Σx)², mean, median, mode, range, mid point, rand, sort up, sort down, rand, population variance, population standard deviation, the sample/experimental variance, sample/experimental standard deviation.
Frequency Distribution: This function lets you enter a string of numbers separated by commas, a low and high range and a number of bins. It then computes how many of the observations are in each of the bins between the high and low values designated.