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Practice problem

One-Tailed vs. Two-Tailed Tests

By Paris

A researcher believes that the average cost of an axolotl is 30 dollars. She samples 30 axolotl pet owners and calculates the mean of the sample, X, to be 10 dollars. She wants to know if this value warrants the conclusion that the average cost of axolotls is smaller than 30 dollars? What kind of hypothesis test would she use?

Choose one answer

Type a concept, like “slope” or “photosynthesis”.

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