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To test H0​: μ=20 versus H1​: μ<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.

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To test H0​:

μ=20 versus H1​: μ<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.

 
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