例题 P(Z<−0.25) P(Z>−1.02) P(−2.55<Z<−0.09)
The standard normal distribution, also called the z-distribution, is a special normal distribution where the mean is 0 and the standard deviation is 1.Any normal distribution can be standardized by converting its values into z scores. Z scores tell you how many standard deviations from the mean...
Use this simple z-Score calculator. Solve for probability, percentile and standard normal distribution curve area. Enter to learn with graphs and plots.
This calculator will tell you the one-tailed (right-tail) area under the standard normal curve, given a Z-score (i.e., the one-tailed probability from the z-score to positive infinity). Please enter the necessary parameter values, and then click 'Calculate'. ...
The graph of normal distribution. Not only is standard deviation a widely-used measure of variation, it forms the basis of other tools which characterize variation, including the quantities calculated by the relative standard deviation calculator and the confidence interval calculator. Standard deviation...
Instructions: You can use step-by-step calculator to get the mean and st. deviation associated to a discrete probability distribution.
This calculator will tell you the two-tailed area under the standard normal curve, given a Z-score (i.e., the two-tailed probability from +/- the Z-score to infinity on both tails of the distribution). Please enter the necessary parameter values, and then click 'Calculate'.Z...
But when we have population information that determines exactly the population distribution, the percentiles can be computed exactly. More specifically, this calculator shows how to compute percentiles when the population mean (\(\mu\)) and standard deviation (\(\sigma\)) are known, and we know...
Variance and standard deviation provide valuable insights into data variability, helping us understand the distribution and spread of values. When comparing datasets, the standard deviation is often more useful as it allows for a direct comparison of the spread, while variance may produce larger values...
The sample size was calculated by WHO sample size calculator where level of significance ([alpha]) = 5%, Power of test (1-[beta]) = 80%, Population Standard Deviation = 95, Test value of Population Mean = 60, Anticipated Population Mean = 294, Sample size (n) = 32 patients in each...