Question

In: Statistics and Probability

Complete an ANOVA table given the following information. You must show all work to receive partial...

Complete an ANOVA table given the following information. You must show all work to receive partial credit.

Question 1: How does a dog’s tail wag in response to seeing different people and other pets?

Owner: 69, 72, 65, 75, 70

Cats: 28, 32, 30, 29, 31

Other dogs: 45, 43, 47, 45, 44

  1. Find the degrees of freedom for each group:

(Remember df = N -1)

Group 1:

Group 2:

Group 3:

  1. Degrees of freedom (within):

  1. Degrees of freedom (total):

  1. Degrees of freedom (between):
  1. Calculate the total sum of squares. Be sure to calculate the grand mean (GM) and the mean (M) for each group before calculating the sum of squares.

Sample

X

(X – GM)

(x – GM)²

Group 1 - owner

M(group 1) =

69

72

65

75

70

Group 2 - cats

M(group 2) =

28

32

30

29

31

Group 3 – other dogs

M(group 3) =

45

43

47

45

44

GM =

SS(total) =

  1. Calculate the Within-Groups Sum of Squares

Sample

X

(X – M)

(x – M)²

Group 1 - owner

M(group 1) =

69

72

65

75

70

Group 2 - cats

M(group 2) =

28

32

30

29

31

Group 3 – other dogs

M(group 3) =

45

43

47

45

44

GM =

SS(within) =

  1. Calculate the Between-Groups Sum of Squares

Sample

X

(M – GM)

(M – GM)²

Group 1 - owner

M(group 1) =

69

72

65

75

70

Group 2 - cats

M(group 2) =

28

32

30

29

31

Group 3 – other dogs

M(group 3) =

45

43

47

45

44

GM =

SS(between) =

  1. Complete the ANOVA table using the information you calculated above

Variance

SS

df

MS

F

Between

Within

---------

Total

         ---------

---------

Solutions

Expert Solution

A B C
count, ni = 5 5 5
mean , x̅ i = 70.200 30.00 44.80
std. dev., si = 3.701 1.581 1.483
sample variances, si^2 = 13.700 2.500 2.200
total sum 351 150 224 725 (grand sum)
grand mean , x̅̅ = Σni*x̅i/Σni =   48.33
square of deviation of sample mean from grand mean,( x̅ - x̅̅)² 478.151 336.111 12.484
TOTAL
SS(between)= SSB = Σn( x̅ - x̅̅)² = 2390.756 1680.556 62.422 4133.733
SS(within ) = SSW = Σ(n-1)s² = 54.800 10.000 8.800 73.6000

no. of treatment , k =   3
df between = k-1 =    2
N = Σn =   15
df within = N-k =   12
  
mean square between groups , MSB = SSB/k-1 =    2066.8667
  
mean square within groups , MSW = SSW/N-k =    6.1333
  
F-stat = MSB/MSW =    336.9891

anova table
SS df MS F p-value
Between: 4133.73 2 2066.87 336.99 0.0000
Within: 73.60 12 6.13
Total: 4207.33 14
α = 0.05
conclusion : p-value<α , reject null hypothesis    

THANKS

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