Using the stack loss dataset, test the hypothesis that the mean of the stackloss is equal to 20 versus a two-sided alternative.

*Solution:*

Codes:

Output:

Interpretation: With the p-value greater than the level of significance alpha at 0.05, then we lack the evidence to reject the null hypothesis. And thus, the true mean is equal to 20.

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**Tags:** Examples, one sample t-test, R Programming