statistics
posted 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: 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
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
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."
Respond to this Question
Similar Questions

Statistics
Find the probability of correctly answering the first 2 questions on a multiple choice test if random guesses re made and each question has 6 possible answers. My answer is 1/36 Assume that the data has a normal distribution and the … 
Statistics
What is the difference between the null and alternative hypotheses statements in onetailed and twotailed tests? 
statistics
Use Excel to find the pvalue for each test statistic.a. Righttailed test, t = +1.677, n = 13 b. Lefttailed test, t = −2.107, n = 5 c. Twotailed test,t = −1.865, n = 34 
Statistics
For all of the following use the five step process to solve the problem in the question, that is, state the null hypothesis, the alternative hypothesis, the level of significance and the type of test (ztest, ttest, pvalue, confidence … 
Statistics/Math
I want to test H0: p = .12 vs. Ha: p ≠ .12 using a test of hypothesis. This test would be called a(n) ____________ test. A) twotailed B) righttailed (this one? 
Statistics
Politicians are interested in knowing the opinions of their constituents on important issues. One administrative assistant to a senator claims that more than 63% of adult women favor stricter gun laws. A recent telephone survey of … 
Statistics
A skeptical paranormal researcher claims that the proportion of Americans that have seen a UFO is less than 5%. the type of alternative hypothesis is: lefttailed righttailed or twotailed Is this righttailed? 
Stat
A company with a fleet of 150 cars found that the emission systems of 7 out of 22 they tested failed to meet pollution control guidelines. Is this strong evidence that more than 20% of the fleet might be out of compliance? 
Statistics
According to a study by the Centers for Disease Control, the national mean hospital stay after childbirth is 2.1 days. Reviewing records at her own hospital, a hospital administrator calculates that the mean hospital stay for a random … 
Statistics
so we will be having a quiz about hypotheses testing and i cant still figure out the difference between the null hypothesis with alternative hypothesis. PLEASE HELP ME DIFFERENTIATE THE TWO. And i still get confused between one tailed …