Flashcards
Coding Data
Cards in this deck (5)
- 1For the set of data xi, where the mean=x̄ , s.d=σ and variance=σ^2 , what happens to these values when we code xi to axi?Mean = ax̄
S.d = aσ
Variance = a^2σ^2 - 2For the set of data xi, where the mean=x̄ , s.d=σ and variance=σ^2 , what happens to these values when we code xi to xi+b?Mean = x̄+b
S.d = σ
Variance = σ^2 - 3For the set of data xi, where the mean=x̄ , s.d=σ and variance=σ^2 , what happens to these values when we code xi to axi+b?Mean = ax̄+b
S.d = aσ
Variance = a^2σ^2 - 4Set of data: 0.61 , 0.67 , 0.63 , 0.63 , 0.66 , 0.65 , 0.64 , 0.68 , 0.64 , 0.62 1. Find a code so that the set can be integers between 1 and 10 2. Find new mean and s.d 3. Find old mean and s.d1. We can do this by multiplying by 100 and taking away 60 ; so 100x-60
2. x̄=4.3 , σ=2.1
3. x̄=0.643 , σ=0.021 - 5—