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Hypothesis Testing

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Given the following hypothesis:

H0: µ≥20
H1: µ<20
A random sample of five resulted in the following values: 18, 15, 12, 19, and 21. Using the .01 significance level, can we conclude the population mean is less than 20?
a. State the decision rule.
b. Compute the value of the test statistic.
c. What is your decision regarding the null hypothesis?
d. Estimate the p-value.
Please indicate what steps in MS Excel are necessary to do calculations for this problem, or name of software that was used.

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