What is Statistics

Statistics:

Statistics is also a main branch of applied mathematics  that includes collection, interpretation, analysis, and conclusions from quantitative data. Mathematical theories rely heavily on mathematical classification and calculation, precise algebra, and probability theory. Two major statistics areas are known as descriptive statistics, which describe sample structures and demographic data.Baseless statistics, which use those structures to test assumptions and draw conclusions.

Statistics Equations:

• • Population mean = μ = ( Σ Xi ) / N.

• • Population standard deviation = σ = sqrt [ Σ ( Xi – μ )2 / N ]

• • Population variance = σ2 = Σ ( Xi – μ )2 / N.

• • Variance of population proportion = σP2 = PQ / n.

• • Standardized score = Z = (X – μ) / σ