Across 4. Health experiment participants who do not change their habits/diets are in the group. An unbiased sample is the best representative of the 95 % of the area under this lies symmetrically within 2 standard deviations of the mean. Research not easily done with an experiment is often done by study Generalized formula for the expansion of (a+b)^n, where n is non-negative Down A distribution can be divided with a vertical line into two parts mirroring each other. Limits how much the responses of a sample differ from the population The geometric arrangement of n C into rows corresponding to the value of n. To attain accurate results it is important to write questions that are Solution 4) Control 5) POpulation 7) normal curve 8) Observational study 9) Binomial theorem --------------------- 1) 2) margin of error 3) Pascal triangle 6) unbiased.