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Then, for the following two examples, determine the null and alternative as well as state which one represents the claim. State what type of test will be completed: left-tailed, right-tailed, or two-tailed.
The average score of the first exam for the class is an 81%.Claim 2: The average price for a gallon of gas is more than $3.00.

  • statistics -

    It depends on what question you are asking.

    Ho: mean = 81%
    Ha: mean ≠ 81%


    Ho: mean = $3.00
    Ha: mean > $3.00

    I'm not sure what you mean by right-tailed or left-tailed. I don't use those specific terms.

  • statistics (more) -

    Upon further thought, right-tailed may be the equivalent to positively skewed (deviant scores at higher values). If so, the second Ha would be right-tailed.

    The mean is influenced by deviant scores, like a fulcrum (balance point). Thus Ha for "more than $3.00" would be looking for a higher mean and "right-tailed."

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