Given the Information $s _ { 1 } ^ { 2 } = 4 , s _ { 2 } ^ { 2 } = 6 , n _ { 1 } = 15 , n _ { 2 } = 25,$

question 47

Multiple Choice

Given the information: $s _ { 1 } ^ { 2 } = 4 , s _ { 2 } ^ { 2 } = 6 , n _ { 1 } = 15 , n _ { 2 } = 25,$ the number of degrees of freedom that should be used in the pooled variance t-test is:

• A)40
• B)38
• C)15
• D)25

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