Asked by lashawn
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.
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.
Answers
Answered by
PsyDAG
It depends on what question you are asking.
Ho: mean = 81%
Ha: mean ≠ 81%
Two-tailed
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.
Ho: mean = 81%
Ha: mean ≠ 81%
Two-tailed
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.
Answered by
PsyDAG
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."
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."