Examlex
For some products, such as automobiles, increasing the amount of a rebate no longer seems to spur additional sales activity, but discontinuing or reducing the rebate level tends to have an immediate negative impact on sales.
Two-Tailed Hypothesis
A statistical test hypothesis that considers both directions of deviation from the null hypothesis, thus testing for the possibility of both positive and negative effects.
Population Proportion
The ratio of a specific subgroup within a population to the entire population, typically expressed as a percentage.
Independent Random Samples
Samples selected from a population in such a way that each member has an equal chance of being chosen, with no dependence between the selections.
Standard Error
The standard deviation of the sampling distribution of a statistic, commonly used to estimate the accuracy of sample mean as a predictor of the population mean.
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