Quickly calculate the standard deviation of a list of numbers. Instatistics, the standard deviation (SD) (represented by the Greekletter sigma, σ) is a measure that is used to quantify the amountof variation or dispersion of a set of data values. A low standarddeviation indicates that the data points tend to be very close tothe mean (also called the expected value) of the set, while a highstandard deviation indicates that the data points are spread outover a wider range of values.

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Z Table Score Calculator allows you toquicklycalculate z-scores.Background: In statistics, the z score (also called az-value,standard score, or normal score) is the signed number ofstandarddeviations by which an observation or data is above themean. Apositive z score indicates a datum above the mean, while anegativez score indicates a datum below the mean. It is adimensionlessquantity obtained by subtracting the population meanfrom anindividual raw score and then dividing the difference bythepopulation standard deviation. This conversion process iscalledstandardizing or normalizing.The z-score is only defined if one knows thepopulationparameters; if one only has a sample set, then theanalogouscomputation with sample mean and sample standard deviationyieldsthe Student's t-statistic.

Quickly calculator confidence intervalsformeans

Get your baby's attention with this camera!This app allows you to easily grab your baby's or pet'sattention with a random sound. It works by overlaying a soundbutton on top of your camera app.Example sounds:- a car's horn- a cat's meow- a cowbell- a door bell- an elephant- a poodle barking- a trumpet- a zingThis is equivalent of the Look Birdy app for Android.