Economics ECON S - 1941 Chapter Notes - Chapter summary: Observational Study, Xunit, Prediction Interval
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Suppose you look back at your data set of the number of coffees you purchased per week in the previous questions and realize that your consumption of coffee in Week 2 was both unhealthy and significantly higher than your "normal" coffee consumption behavior. If the 100 cups you consumed is not a good representation of your "population" behavior, what will this do the estimates of the sample mean and sample variance relative to their population values?
Only the sample variance will be biased |
Neither the sample mean nor the variance will be biased |
Both the sample mean and variance will be biased |
Only sample mean will be biased. |