RAW DATA:

20, 30, 40, 50

Use the table below to calculate the standard deviation of the raw data step-by-step

x x-mean (x-mean)²20

20

30

40

50

n = mean = Sum=

x1 = 20 x1-mean=________ (x1-mean)²

x2= 30 x2-mean=________ (x2-mean)²

x3=40 x3-mean=________ (x3-mean)²

x4=50 x4-mean=________ (x4-mean)²

n=_______ mean=________ sum of last column________

range=_______ enter a singe value not an interval

divide the sum of the last column you found by n:______

the square toot of the quotient is 0^- = _________

divide the sum of the last column you found by (n-1)________

the square root of the quotient found is S=_________

Because n<30, the value for the SD is S.That is, the standard deviation of the raw data is_______________