An automobile manufacturer has given its car a 37.1 miles/gallon (MPG) rating. An independent testing firm has been contracted to test the actual MPG for this car since it is believed that the car has an incorrect manufacturer's MPG rating. After testing 160 cars, they found a mean MPG of 37.0 . Assume the population standard deviation is known to be 1.5 . Is there sufficient evidence at the 0.1 level to support the testing firm's claim? Step 2 of 6 : Find the value of the test statistic. Round your answer to two decimal places.
Added by Silvia T.
Step 1
1. The alternative hypothesis (Ha) is that the manufacturer's MPG rating is incorrect, meaning the true population mean MPG is not 37.1. Show more…
Show all steps
Close
Your feedback will help us improve your experience
Hoan Nguyen and 76 other Intro Stats / AP Statistics educators are ready to help you.
Ask a new question
Labs
Want to see this concept in action?
Explore this concept interactively to see how it behaves as you change inputs.
Key Concepts
Recommended Videos
An automobile manufacturer has given its car a 36.6 miles/gallon (MPG) rating. An independent testing firm has been contracted to test the actual MPG for this car since it is believed that the car performs under the manufacturer's MPG rating. After testing 170 cars, they found a mean MPG of 36.5 . Assume the population standard deviation is known to be 2.3 . Is there sufficient evidence at the 0.1 level to support the testing firm's claim? Step 2 of 6 : Find the value of the test statistic. Round your answer to two decimal places.
Hoan N.
An automobile manufacturer has given its car a 59.5 miles/gallon (MPG) rating. An independent testing firm has been contracted to test the actual MPG for this car since it is believed that the car performs under the manufacturer's MPG rating. After testing 250 cars, they found a mean MPG of 59.4 . Assume the population standard deviation is known to be 1.9 . Is there sufficient evidence at the 0.05 level to support the testing firm's claim? Step 2 of 6 : Find the value of the test statistic. Round your answer to two decimal places.
Ivan K.
An automobile manufacturer has given its car a 36.6 miles/gallon (MPG) rating. An independent testing firm has been contracted to test the actual MPG for this car since it is believed that the car performs over the manufacturer's MPG rating. After testing 170 cars, they found a mean MPG of 36.7. Assume the population standard deviation is known to be 2.3. Is there sufficient evidence at the 0.1 level to support the testing firm's claim? Step 2 of 6 : Find the value of the test statistic. Round your answer to two decimal places.
Supreeta N.
Recommended Textbooks
Elementary Statistics a Step by Step Approach
The Practice of Statistics for AP
Introductory Statistics
Transcript
18,000,000+
Students on Numerade
Trusted by students at 8,000+ universities
Watch the video solution with this free unlock.
EMAIL
PASSWORD