Identity Problems: For 3944, prove that the given equation is an identity.

Studies Sample Survey: part of population that information is collected on Observational Study: observe and measure but does no influence the response Experimental Study: A treatment is performed in order to observe responses. Can give good evidence to what causes the response Population: the true value that the parameter describes Sample: a small quantity that is use to calculate the Statistics Parameter: Number describing Population Statistics: number describing sample, and use to estimate the parameter Sampling methods Simple random sample: Basic Sampling method All individuals has an equal chance of being chosen of being picked First label each individual in popu