Examlex
The first large-scale use of the pesticide DDT was to improve American crop production.
Non-directional
A hypothesis that does not specify a direction of difference or association between two variables.
Standard Error
A measure of the statistical accuracy of an estimate, indicating how much the sample mean is expected to vary from the true population mean.
Mean
The average of a set of numbers, calculated by dividing the sum of all values by the count of values, and used as a measure of central tendency.
Z-statistic
A type of standard score that represents the distance in standard deviations a data point is from the mean, used in significance testing.
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