SOLUTION: can some one please help me with this i do not even know how to get started with this. consumer reports stated that the mean time for a chrysler concorde to go from 0 to 60 mile

Question 153080: can some one please help me with this i do not even know how to get started with this.
consumer reports stated that the mean time for a chrysler concorde to go from 0 to 60 miles per hour was 8.7 seconds.
a) if you want to set up a statistical test to challenge the claim of 8.7 seconds what would you use for the null hypothesis? AM I CORRECT WHEN THIS ANSWER Ho: u = 8.7?
b) the town of leadville, colorado, has an elevation over 10,000 feet. Suppose you wanted to test the claim that the average time to accelerate from 0 to 60 miles per hour is longer in leadville ( because of less oxygen). What would you use for the alternate hypothesis? I HOPE THIS IS RIGHT TOO H1 : U> 10,000
C) Suppose you made an engine modification and you think that they average time to accelerate from 0 to 60 miles per hour has been reduced. What would you use for the alernate hypothesis? NOW THIS IS WHERE I GET CONFUSED. BUT I AM GOING TO TRY IT H1: U< 0 TO 60
d) For each of the tests in parts (b) and (c), would the P-value area be on the left, on the right, or on both sides of the mean> Explain your answer in each case?
This part i do not understand at all?
Julie

Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
consumer reports stated that the mean time for a chrysler concorde to go from 0 to 60 miles per hour was 8.7 seconds.
a) if you want to set up a statistical test to challenge the claim of 8.7 seconds what would you use for the null hypothesis? AM I CORRECT WHEN THIS ANSWER Ho: u = 8.7?
Ans: You are correct
--------------------------
b) the town of leadville, colorado, has an elevation over 10,000 feet. Suppose you wanted to test the claim that the average time to accelerate from 0 to 60 miles per hour is longer in leadville ( because of less oxygen). What would you use for the alternate hypothesis? I HOPE THIS IS RIGHT TOO H1 : U> 10,000
Ans: You should use u > 8.7
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C) Suppose you made an engine modification and you think that they average time to accelerate from 0 to 60 miles per hour has been reduced. What would you use for the alernate hypothesis? NOW THIS IS WHERE I GET CONFUSED. BUT I AM GOING TO TRY IT H1: U< 0 TO 60
Ans: You should use u < 8.7
--------------------------------
d) For each of the tests in parts (b) and (c), would the P-value area be on the left, on the right, or on both sides of the mean> Explain your answer in each case?
b) Since the alternate is "greater than" the p-value is on the right.
c) Since the alternate is "less than" the p-value is on the left.
========================
Cheers,
Stan H.
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