A research study took a sample of car accidents on the beltw

A research study took a sample of car accidents on the beltway. More car accidents were fatal when the driver was talking on a cell phone (2), than when the driver was not talking on a cell phone (1). What is the correct alternative hypothesis?

Ha: P₁ - P₂ < 0

  Ha: P₁ - P₂ > 0

Ha: P₁ - P₂ = 0

  Ha: P₁ - P₂ ? 0

Solution

The correct alternate hypothesis is : Ha : p1 - p2 <0.

The diffrence should be negative since P1 is smaller than P2.

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