$\operatorname { var } ( a X + b Y ) =$

question 26

Multiple Choice

$\operatorname { var } ( a X + b Y ) =$

• A) \(a ^ { 2 } \sigma _ { X } ^ { 2 } + b ^ { 2 } \sigma _ { Y } ^ { 2 }\)
• B) \(a ^ { 2 } \sigma _ { X } ^ { 2 } + 2 a b \sigma _ { X Y } + b ^ { 2 } \sigma _ { Y } ^ { 2 }\)
• C) \(\sigma _ { X Y } + \mu _ { X } \mu _ { Y }\)
• D) \(a \sigma _ { X } ^ { 2 } + b \sigma _ { Y } ^ { 2 }\)

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Definitions:

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