The sampling distribution of the ratio of two independent sample variances selected randomly from normal populations with equal
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change
given you
making x the subject by transferring the -19 to the right hand side of the equation
dividing through by 5
{}
also given
change the operation sign to =
dividing through by -4
so the truth set is
{x:x>9/4}.
The < sign changes to > because we divided by a negative number when solving for x