Question

An expert reviews a sample of 10 scientific articles (n = 10) and records the following...

An expert reviews a sample of 10 scientific articles (n = 10) and records the following number of errors in each article: 9, 7, 0, 1, 4, 7, 6, 8, 0, and 3. Compute SS, variance, and standard deviation for this sample using the definitional and computational formula. (Round your answers to two decimal places.)

SS

variance

standard deviation

Homework Answers

Answer #1

Sample mean = X / n = 4.5

a)

SS = ( Xi - )2

= = (9 - 4.5)2 + (7 - 4.5)2 + (0 - 4.5)2 + (1 - 4.5)2 + (4 - 4.5)2 + (7 - 4.5)2 + (6 - 4.5)2 + (8 - 4.5)2 + (0 - 4.5)2 + (3 - 4.5)2

= 102.5

b)

Variance = SS / ( n -1)

= 102.5 / ( 10 - 1)

= 11.39

c)

Standard deviation = sqrt ( Variance)

= sqrt ( 11.39)

= 3.37

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