Sxx Variance Formula _hot_ Direct

: ( s_x^2 = 40 / (5-1) = 10 ). So the variance of hours studied is 10.

s2=204−1=203≈6.67s squared equals the fraction with numerator 20 and denominator 4 minus 1 end-fraction equals 20 over 3 end-fraction is approximately equal to 6.67 Why is Sxx Important? (Real-World Applications) Sxxcap S sub x x end-sub Sxx Variance Formula

Sxx=16+4+0+4+16=40cap S sub x x end-sub equals 16 plus 4 plus 0 plus 4 plus 16 equals 40 Method 2: Using the Computational Formula : ( s_x^2 = 40 / (5-1) = 10 )

∑x2=22+42+62+82+102sum of x squared equals 2 squared plus 4 squared plus 6 squared plus 8 squared plus 10 squared (Real-World Applications) Sxxcap S sub x x end-sub

By dividing Sxx by (n-1), we get the sample variance:

Elara looked at the spreadsheet again. The numbers were tight. The data points were clustered closely around the mean. "Yeah. It’s a small number."

Sxx = 0 + 100 + 100 + 25 + 25 = 250