Posted by lashawn on Sunday, December 16, 2012 at 7:12pm.
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: lefttailed, righttailed, or twotailed.
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  PsyDAG, Monday, December 17, 2012 at 11:36pm
It depends on what question you are asking.
Ho: mean = 81%
Ha: mean ≠ 81%
Twotailed
Ho: mean = $3.00
Ha: mean > $3.00
I'm not sure what you mean by righttailed or lefttailed. I don't use those specific terms.

statistics (more)  PsyDAG, Tuesday, December 18, 2012 at 12:52am
Upon further thought, righttailed may be the equivalent to positively skewed (deviant scores at higher values). If so, the second Ha would be righttailed.
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 "righttailed."
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