Find the critical values
χ2l=χ21−α/2 χ l 2 = χ 1 − α / 2 2 and χ2r=χ2α/2 χ r 2 = χ α / 2 2
that correspond to 80 % degree of confidence and the sample size
n=15.
χ2l= χ l 2 =
χ2r= χ r 2 =

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