An automobile manufacturer claims that its van has a 38.4 miles/gallon (MPG) rating. An independent testing firm has been contracted to test the MPG for this van since it is believed that the van has an incorrect manufacturer's MPG rating. After testing 240 vans, they found a mean MPG of 38.1. Assume the standard deviation is known to be 2.0. A level of significance of 0.05 will be used. Find the value of the test statistic. Round your answer to 2 decimal places. Enter the value of the test statistic.
Added by Carmen S.
Close
Step 1
We are given the following information: - The manufacturer claims a mean MPG of 38.4 (μ = 38.4) - The independent testing firm found a sample mean MPG of 38.1 (x̄ = 38.1) - The sample size is 240 (n = 240) - The standard deviation is known to be 2.0 (σ Show more…
Show all steps
Your feedback will help us improve your experience
Kari Hasz and 91 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
Sheryl E.
An automobile manufacturer claims that its jeep has a 48.2 miles/gallon (MPG) rating. An independent testing firm has been contracted to test the MPG for this jeep since it is believed that the jeep has an incorrect manufacturer's MPG rating. After testing 170 jeeps, they found a mean MPG of 48.3. Assume the standard deviation is known to be 2.0. A level of significance of 0.02 will be used. Find the value of the test statistic. Round your answer to 2 decimal places. Enter the value of the test statistic.
Ana Carolina D.
An automobile manufacturer has given its van a 33.3 miles/gallon (MPG) rating. An independent testing firm has been contracted to test the actual MPG for this van sinc believed that the van performs over the manufacturer's MPG rating. After testing 210 vans, they found a mean MPG of 33.5. 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 4 of 6: Find the P-value of the test statistic. Round your answer to four decimal places.
Madhur L.
Recommended Textbooks
Elementary Statistics a Step by Step Approach
The Practice of Statistics for AP
Introductory Statistics
Transcript
Watch the video solution with this free unlock.
EMAIL
PASSWORD