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Exxon is claiming that the cost of a barrel of oil is $50. They sampled 200 barrels of oil. Using a significance level of .05.

Exxon is claiming that the cost of a barrel of oil is $50. They sampled 200 barrels of oil.

Using a significance level of .05.

If z or t = 2.13

Step 5: make the decision regarding H₀ and interpret the results.

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