Find the t-value that bound in the middle of 80% with sample size 12
P(−t<T<t)=0.8→P(T<t)=0.9.P(-t<T<t)=0.8 \to P(T<t)=0.9.P(−t<T<t)=0.8→P(T<t)=0.9.
From the table of t-values : t=1.36.t=1.36.t=1.36.
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