A-Level Edexcel Mathematics A2 S3.3.8 - Use of large sample results Topic Practice

• 3.8 Use of large sample results to (X −Y)−(µ −µ) Use of x y ∼ N(0, 1). extend to the case in which the S2 S2 population variances are unknown. x + y n n x y A knowledge of the t-distribution is not required.