An automobile manufacturer claims that their van has a 47.8 miles/gallon (MPG) rating. An independent testing firm has been contracted to test the MPG for this van. After testing 81 vans they found a mean MPG of 47.5 with a variance of 4 MPG. Is there sufficient evidence at the 0.05 level that the vans underperform the manufacturer's MPG rating?
State the null and alternative hypotheses for the above scenario.
An automobile manufacturer claims that their van has a 47.8 miles/gallon (MPG) rating. An independent testing...
An automobile manufacturer claims that their van has a 41.5 miles/gallon (MPG) rating. An independent testing firm has been contracted to test the MPG for this van. After testing 13 vans they found a mean MPG of 41.4 with a variance of 2.25 MPG. Is there sufficient evidence at the 0.05 level that the vans have an incorrect manufacturer's MPG rating? State the null and alternative hypotheses for the above scenario.
An automobile manufacturer claims that their van has a 40.6 miles/gallon (MPG) rating. An Independent testing firm has been contracted to test the MPG for this van. After testing 27 vans they found a mean MPG of 40.2 with a standard deviation of 2.1. Is there sufficient evidence at the 0.05 level that the vans underperform the manufacturer's MPG rating? Assume the population distribution is approximately normal. Step 1 of 5: State the null and alternative hypotheses. Answer 2 Points...
An automobile manufacturer claims that their van has a 28.2 miles/gallon (MPG) rating. An independent testing firm has been contracted to test the MPG for this van. After testing 27 vans they found a mean MPG of 28.0 with a standard deviation of 2.6. Is there sufficient evidence at the 0.01 level that the vans underperform the manufacturer's MPG rating? Assume the population distribution is approximately normal Step 1 of 5: State the null and alternative hypotheses. Answer 2 Points...
An automobile manufacturer claims that their van has a 38.7 miles/gallon (MPG) rating, an independent testing firm has been contracted to test the MPG for this van. After testing 13 vans they found a mean MPG of 38.2 with a standard deviation of 1.7. is there sufficient evidence at the 0.025 level that the vans underperform the manufacturer's MPG rating? Assume the population distribution is approximately normal Step 4 of 5: Determine the decision rule for rejecting the null hypothesis....
An automobile manufacturer claims that their van has a 52.352.3 miles/gallon (MPG) rating. An independent testing firm has been contracted to test the MPG for this van. After testing 250250 vans they found a mean MPG of 52.552.5. Assume the standard deviation is known to be 2.02.0. Is there sufficient evidence at the 0.10.1 level that the vans outperform the manufacturer's MPG rating? Step 1 of 5 : Enter the hypotheses:
An automobile manufacturer claims that their van has a 38.7 miles/gallon (MPG) rating. An independent testing firm has been contracted to test the MPG for this van. After testing 13 vans they found a mean MPG of 38.2 with a standard deviation of 1.7. Is there sufficier evidence at the 0.025 level that the vans underperform the manufacturer's MPG rating? Assume the population distribution is approximately normal Step 4 of 5: Determine the decision rule for rejecting the null hypothesis....
An automobile manufacturer daims that their van has a 49.7 miles/gallon (MPG) rating. An independent testing firm has been contracted to test the MPG for this van. After testing 12 vans they found a mean MPG of 49.4 with a standard deviation of 1.6. Is there sufficient evidence at the 0.05 level that the vans underperform the manufacturer's MPG rating? Assume the population distribution is approximately normal Step 4 of 5: Determine the decision rule for rejecting the null hypothesis....
An automobile manufacturer claims that their van has a 40.0 miles/gallon (MPG) rating. An independent testing firm has been contracted to test the MPG for this van. After testing 25 vans they found a mean MPG of 39.7 with a standard deviation of 2.0. Is there sufficient evidence at the 0.05 level that the vans have an incorrect manufacturer's MPG rating? Assume the population distribution is approximately normal. Step 4 of 5 : Determine the decision rule for rejecting the...
An automobile manufacturer claims that their car has a 56.7 miles/gallon (MPG) rating. An independent testing firm has been contracted to test the MPG for this car. After testing 14 cars they found a mean MPG of 56.6 with a standard deviation of 1.1. Is there sufficient evidence at the 0.1 level that the cars underperform the manufacturer's MPG rating? Assume the population distribution is approximately normal. Step 1 of 5: State the null and alternative hypotheses. Answer 2 Points...
An automobile manufacturer claims that their van has a 40.040.0 miles/gallon (MPG) rating. An independent testing firm has been contracted to test the MPG for this van. After testing 2525 vans they found a mean MPG of 39.739.7 with a standard deviation of 2.02.0. Is there sufficient evidence at the 0.050.05 level that the vans have an incorrect manufacturer's MPG rating? Assume the population distribution is approximately normal. Step 2 of 5 : Find the value of the test statistic....