Question

An automobile manufacturer has given its jeep a 31.2 miles/gallon (MPG) rating. An independent testing firm has been contracted to test the actual MPG for this jeep since it is believed that the jeep has an incorrect manufacturer's MPG rating. After testing 230 jeeps, they found a mean MPG of 31.4. Assume the population standard deviation is known to be 2.5. A level of significance of 0.05 will be used. State the null and alternative hypotheses.

Answer #1

An automobile manufacturer has given its jeep a 46.3
miles/gallon (MPG) rating. An independent testing firm has been
contracted to test the actual MPG for this jeep since it is
believed that the jeep has an incorrect manufacturer's MPG rating.
After testing 200 eeps, they found a mean MPG of 46.7 . Assume the
population variance is known to be 6.25 . A level of significance
of 0.05 will be used. State the null and alternative
hypotheses.

An automobile manufacturer has given its jeep a 50.5
miles/gallon (MPG) rating. An independent testing firm has been
contracted to test the actual MPG for this jeep since it is
believed that the jeep has an incorrect manufacturer's MPG rating.
After testing 280 jeeps, they found a mean MPG of 50.7. Assume the
population standard deviation is known to be 1.3. A level of
significance of 0.05 will be used. Make the decision to reject or
fail to reject the...

An automobile manufacturer has given its jeep a 25.3
miles/gallon (MPG) rating. An independent testing firm has been
contracted to test the actual MPG for this jeep since it is
believed that the jeep has an incorrect manufacturer's MPG rating.
After testing 190 jeeps, they found a mean MPG of 25.1. Assume the
population standard deviation is known to be 2.4. A level of
significance of 0.02 will be used. Make the decision to reject or
fail to reject the...

An automobile manufacturer has given its jeep a 52.8
miles/gallon (MPG) rating. An independent testing firm has been
contracted to test the actual MPG for this jeep since it is
believed that the jeep has an incorrect manufacturer's MPG rating.
After testing 230 jeeps, they found a mean MPG of 52.7. Assume the
population standard deviation is known to be 1.0. Is there
sufficient evidence at the 0.1 level to support the testing firm's
claim?
State the null and alternative...

An automobile manufacturer claims that its jeep has a 37.0
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
140 jeeps, they found a mean MPG of 37.2. Assume the variance is
known to be 1.69. A level of significance of 0.05 will be used.
Find the value of the test statistic. Round your answer to 2...

An automobile manufacturer claims that its jeep has a 59.8
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
160 jeeps, they found a mean MPG of 59.7. Assume the standard
deviation is known to be 1.3. A level of significance of 0.02 will
be used. Find the value of the test statistic. Round your answer to...

An automobile manufacturer has given its van a 31.2 miles/gallon
(MPG) rating. An independent testing firm has been contracted to
test the actual MPG for this van since it is believed that the van
performs over the manufacturer's MPG rating. After testing 210
vans, they found a mean MPG of 31.4 . Assume the population
standard deviation is known to be 1.0 . Is there sufficient
evidence at the 0.05 level to support the testing firm's claim?
Step 2 of...

An automobile manufacturer has given its car a 46.2 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 240 cars,
they found a mean MPG of 46.4 . Assume the population variance is
known to be 2.56 . A level of significance of 0.05 will be used.
State the null and alternative hypotheses.

An automobile manufacturer has given its jeep a 31.4
miles/gallon (MPG) rating. An independent testing firm has been
contracted to test the actual MPG for this jeep since it is
believed that the jeep performs under the manufacturer's MPG
rating. After testing 110 jeeps, they found a mean MPG of 31.6.
Assume the population standard deviation is known to be 1.9. Is
there sufficient evidence at the 0.02 level to support the testing
firm's claim?
Step 1 of 6: State...

An automobile manufacturer has given its van a 31.8 miles/gallon
(MPG) rating. An independent testing firm has been contracted to
test the actual MPG for this van since it is believed that the van
has an incorrect manufacturer's MPG rating. After testing 210 vans,
they found a mean MPG of 31.7. Assume the population standard
deviation is known to be 2.6. Is there sufficient evidence at the
0.05 level to support the testing firm's claim? Step 5 of 6 :...

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