Samples Were Drawn from Three Populations $n _ { 1 } = 7 , n _ { 2 } = 7$

question 30

Multiple Choice

Samples were drawn from three populations. The sample sizes were $n _ { 1 } = 7 , n _ { 2 } = 7$ and $n _ { 3 } = 5$ The sample means were $\bar { x } _ { 1 } = 1.27 , \bar { x } _ { 2 } = 1.99 \text {, and } \bar { x } _ { 3 } = 1.49 \text {. }$ The sample standard deviations were $s _ { 1 } = 0.25 , s _ { 2 } = 0.28 , \text { and } s _ { 3 } = 0.25$ The grand mean is $\bar { x } = 1.593158$
How many degrees of freedom are there for SSTr.

• A) 2
• B) 3
• C) 16
• D) 15

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