Examlex
How many Apple Application Store downloads were made by users in the five months spanning July 2008 to December 2008?
Z Statistic
A type of standard score that indicates how many standard deviations an element is from the mean of its population.
Normal Distribution
A bell-shaped frequency distribution curve that is symmetric about the mean, showing that data near the mean are more frequent in occurrence.
One-tailed Test
A statistical hypothesis test in which the alternative hypothesis specifies a direction of the effect.
One-tailed Hypothesis Test
A statistical test in which the region of rejection is on only one side of the sampling distribution, used when a specific direction for the data is predicted.
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