Z Score to Percentile & Formulas

 

Left / Right / Two Tailed Test

Left Tailed Test

H1: parameter < value

Notice the inequality points to the left

Decision Rule: Reject H0 if t.s. < c.v.

Two Tailed Test

H1: parameter not equal value

Another way to write not equal is < or >

Notice the inequality points to both sides.

Right Tailed Test

H1: parameter > value

Notice the inequality points to the right

Decision Rule: Reject H0 if t.s. > c.v.

P Value from Z score Formula

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