A study was designed to study the effect on miles per gallon with and without a...
A study was designed to study the effect on miles per gallon with and without a fuel additive. 15 automobiles were tested with and without the additive and the results compared. This is an example of a:
A Paired t-test
B 1-Sample t-test
C 2-Sample t-test
D Test for equal variances
Homework Answers
Answer.A paired t test
Since we know that The paired sample t-test, sometimes called the dependent sample t-test, is a statistical procedure used to determine whether the mean difference between two sets of observations is zero. In a paired sample t-test, each subject or entity is measured twice, resulting in pairs of observations.
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A study was designed to study the effect on miles per gallon
with and without a...
5. Thirty automobiles were tested for fuel efficiency in miles per gallon. The following frequency distribution...
5. Thirty automobiles were tested for fuel efficiency in miles per gallon. The following frequency distribution was obtained. Calculate the mean. Class Boundaries Frequency 7.5-12.5 12.5-17.5 17.5-22.5 225-275 27.5-32.5 a 552 b.20.33 c.610 d. 25
A research firm tests the miles-per-gallon characteristics of three brands of gasoline. Be- cause of different g...
A research firm tests the miles-per-gallon characteristics of three brands of gasoline. Be- cause of different gasoline performance characteristics in different brands of automobiles five brands of automobiles are selected and treated as blocks in the experiment; that is. each brand of automobile is tested with each type of gasoline. The results of the experiment (in miles per gallon) follow. 40. Gasoline Brands 21 20 24 30 Automobiles 29 25 23 24 24 20 a. At a- 05, is there...
The table shows the gas mileage (in miles per gallon) of eight cars with and without using a fuel additive. Your friend claims that the fuel additive improved gas mileage.
The table shows the gas mileage (in miles per gallon) of eight cars with and without using a fuel additive. Your friend claims that the fuel additive improved gas mileage.Car 1 2 3 4 5 6 7 8Gas mileage without additive 35.8 37.7 39.4 36.8 36.6 33.7 38.4 37.3Gas mileage with additive 36.2 39.8 40.1 39.3 36.9 34.5 38.8 39.1a. State the null and the alternative hypotheses.b. At a=0.01, test your friend’s claim.
7. Bastien, Inc, has been manufacturing small automobiles that have averaged 50 miles per gallon of...
7. Bastien, Inc, has been manufacturing small automobiles that have averaged 50 miles per gallon of gasoline in highway driving. The company has developed a more efficient engine for its small cars and now advertises that its new small cars average more than 50 miles per gallon in highway driving. An independent testing service road-tested 36 of the automobiles. The sample showed an average of 51.5 miles per gallon with a standard deviation of 6 miles per gallon. Using the...
Ahmadi, Inc. has been manufacturing small automobiles that have averaged 50 miles per gallon of gasoline...
Ahmadi, Inc. has been manufacturing small automobiles that have averaged 50 miles per gallon of gasoline in highway driving. The company has developed a more efficient engine for its small cars and now advertises that its new small cars average more than 50 miles per gallon in highway driving. To test this hypothesis at 98% level of confidence, an independent testing service road-tested 64 of the automobiles. The sample showed an average of 51 miles per gallon. Assume that the...
Ahmadi, Inc. has been manufacturing small automobiles that have averaged 50 miles per gallon of gasoline...
Ahmadi, Inc. has been manufacturing small automobiles that have averaged 50 miles per gallon of gasoline in highway driving. The company has developed a more efficient engine for its small cars and now advertises that its new small cars average more than 50 miles per gallon in highway driving. An independent testing service road-tested 64 of the automobiles. The sample showed an average of 51 miles per gallon with a standard deviation of 4 miles per gallon. You want to...
In this exercise involving paired differences, consider that it is reasonable to assume the populations being...
In this exercise involving paired differences, consider that it is reasonable to assume the populations being compared have approximately the same shape and that the distribution of paired differences is approximately symmetric. Two fuel additives are tested to determine their effect on miles per gallon for passenger cars. Suppose test results for 12 cars follow; each car was tested with both fuel additives. Additive Car 1 1 | 2 20.12 19.05 23.56 20.77 2 3 21.03 22.57 4 20.15 17.06...
A department of transportation's study on driving speed and miles per gallon for midsize automobiles resulted...
A department of transportation's study on driving speed and miles per gallon for midsize automobiles resulted in the following data: Speed (Miles per Hour) 30 50 40 55 30 24 60 24 51 56 Miles per Gallon 28 24 24 22 30 33 21 Compute the sample correlation coefficient (to 2 decimals and enter negative value as negative number). 35 26 24 What can you conclude, based on your computation of the sample correlation coefficient? - Select your answer -...
A department of transportation's study on driving speed and miles per gallon for midsize automobiles resulted...
A department of transportation's study on driving speed and miles per gallon for midsize automobiles resulted in the following data: Speed (Miles per Hour) Miles per Gallon Compute the sample correlation coefficient (to 2 decimals and enter negative value as negative number) 29513955 2924 60 25 50 55 28 24 2523 303221 36 25 25 What can you conclude, based on your computation of the sample correlation coefficient? Select your answer Select the correct interpretation for the sample correlation coefficient....
Thirty-four automobiles were tested for fuel efficiency (in miles per gallon). The following frequency distribution was...
Thirty-four automobiles were tested for fuel efficiency (in miles per gallon). The following frequency distribution was obtained. Find the variance and standard deviation. Round your answers to one decimal place. Class boundaries 7.5-12.5 12.5-17.5 17.5-22.5 22.5-27.5 27.5-32.5 Frequency 14 Download data Variance- Standard deviation =
5. Thirty automobiles were tested for fuel efficiency in miles per gallon. The following frequency distribution was obtained. Calculate the mean. Class Boundaries Frequency 7.5-12.5 12.5-17.5 17.5-22.5 225-275 27.5-32.5 a 552 b.20.33 c.610 d. 25
A research firm tests the miles-per-gallon characteristics of three brands of gasoline. Be- cause of different gasoline performance characteristics in different brands of automobiles five brands of automobiles are selected and treated as blocks in the experiment; that is. each brand of automobile is tested with each type of gasoline. The results of the experiment (in miles per gallon) follow. 40. Gasoline Brands 21 20 24 30 Automobiles 29 25 23 24 24 20 a. At a- 05, is there...
7. Bastien, Inc, has been manufacturing small automobiles that have averaged 50 miles per gallon of gasoline in highway driving. The company has developed a more efficient engine for its small cars and now advertises that its new small cars average more than 50 miles per gallon in highway driving. An independent testing service road-tested 36 of the automobiles. The sample showed an average of 51.5 miles per gallon with a standard deviation of 6 miles per gallon. Using the...
In this exercise involving paired differences, consider that it is reasonable to assume the populations being compared have approximately the same shape and that the distribution of paired differences is approximately symmetric. Two fuel additives are tested to determine their effect on miles per gallon for passenger cars. Suppose test results for 12 cars follow; each car was tested with both fuel additives. Additive Car 1 1 | 2 20.12 19.05 23.56 20.77 2 3 21.03 22.57 4 20.15 17.06...
A department of transportation's study on driving speed and miles per gallon for midsize automobiles resulted in the following data: Speed (Miles per Hour) 30 50 40 55 30 24 60 24 51 56 Miles per Gallon 28 24 24 22 30 33 21 Compute the sample correlation coefficient (to 2 decimals and enter negative value as negative number). 35 26 24 What can you conclude, based on your computation of the sample correlation coefficient? - Select your answer -...
A department of transportation's study on driving speed and miles per gallon for midsize automobiles resulted in the following data: Speed (Miles per Hour) Miles per Gallon Compute the sample correlation coefficient (to 2 decimals and enter negative value as negative number) 29513955 2924 60 25 50 55 28 24 2523 303221 36 25 25 What can you conclude, based on your computation of the sample correlation coefficient? Select your answer Select the correct interpretation for the sample correlation coefficient....
Thirty-four automobiles were tested for fuel efficiency (in miles per gallon). The following frequency distribution was obtained. Find the variance and standard deviation. Round your answers to one decimal place. Class boundaries 7.5-12.5 12.5-17.5 17.5-22.5 22.5-27.5 27.5-32.5 Frequency 14 Download data Variance- Standard deviation =
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