Edexcel A Level Maths – Statistics Questions with Correct Answers.

Linear Regression Correct Answer y = axⁿ logy = loga + nlogx Exponential Regression Correct Answer y = ab^x logy = loga + xlogb Normal Approximation Correct Answer µ = np σ =√(np(1-p)) Mean Correct Answer ∑x ÷ n GF: ∑xf ÷ ∑f Variance Correct Answer (∑x²/n) - (∑x/n)² Standard Deviation Correct Answer √variance Histograms: Height Correct Answer Area = k x frequency Frequency Density Correct Answer frequency ÷ class width Population Correct Answer Whole set of items of interest. Census Correct Answer Observes/measures every member of a population Sample Correct Answer Selection of observations taken from a subset of the population which is used to find out info about the population. Sampling Frame Correct Answer A list of individuals (named or numbered) from whom the sample is drawn Random Sampling Correct Answer Every member of the population has an equal chance of being selected Systematic Sampling Correct Answer Every nth person is chosen.