Probability Statistics Formula Sheet - For the quadratic equation ax 2 + bx + c = 0 : Expected value of x = e(x) = μ x = σ [ x i * p(x i) ]; (iv) p a p = a. N ( a + l ) = 1 n { 2 a + ( n 1 ) d } 2 2 −. (iii) p 1 = p 1. = − b ± √ ( b 2 − 4 ac ) x. A > b means a is bigger than b. 2 a for an arithmetic series: P(a ∩ b) = p(a) p(b|a); Un = a + ( n − 1 ) d , sn = 1.
A+z b a = z (ii) a(b + c) = a b + a c. ( a + b ) n = an + n. A b means that a is less than or the same as b. The following formulas assume that x has a binomial distribution, the probability of success is p, the number of trials is n. P(a ∩ b) = p(a) p(b|a); = − b ± √ ( b 2 − 4 ac ) x. A is less than b. (iii) p 1 = p 1. Probability the chance of a certain event happening. Un = a + ( n − 1 ) d , sn = 1. Web the correct formula for degrees of freedom (df) depends on the situation (the nature of the test statistic, the number of samples, underlying assumptions, etc.). Un = ar n − 1 , a ( 1 − rn ) sn = ( − r ≠ 1 ), ∞ = r. Expected value of x = e(x) = μ x = σ [ x i * p(x i) ]; For the quadratic equation ax 2 + bx + c = 0 : N ( a + l ) = 1 n { 2 a + ( n 1 ) d } 2 2 −. 1 r − 1 ( < ) binomial expansion: { the point that cuts the interval (a+b) [a; A > b means a is bigger than b. 2 a for an arithmetic series: (iv) p a p = a.