Question: To test H 0 : = 20 versus H1: < 20 , a simple random sample of size n = 20 is obtained from a

To test H₀: =20 versus H1: <20, a simple random sample of size n=20 is obtained from a population that is known to be normally distributed. Answer parts(a)-(d).

(a) If x overbar =18.2 and =4.5, compute the test statistic.

The part below is what I am having trouble finding...

t = ...BLANK...?

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