Question

High-power experimental engines are being developed by the Stevens Motor Company for use in its new...

High-power experimental engines are being developed by the Stevens Motor Company for use in its new sports coupe. The engineers have calculated the maximum horsepower for the engine to be 620HP. Nine engines are randomly selected for horsepower testing. The sample has an average maximum HP of 690 with a standard deviation of 60HP. Assume the population is normally distributed. Step 1 of 2 : Calculate a confidence interval for the average maximum HP for the experimental engine. Use a significance level of α=0.05. Round your answers to two decimal places.

Math   Statistics-And-Probability   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

Given

= 60

n=9

X_bar = 690

= 0.05

Now calculate 95% of confidence interval using formula is given by

CI = x_bar t*(/n)

The t value for 95% confidence interval with 8 degree of freedom is 2.306

i.e t = 2.306

CI = 690 2.306*(60/9)

= 690 46.12

CI = 690 - 46.12 and CI = 690 + 46.12

= 643.88 CI = 736.12

Hence 95% of confidence interval is (643.88 to 736.12).

0 0
Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
High-power experimental engines are being developed by the Stevens Motor Company for use in its new...
High-power experimental engines are being developed by the Stevens Motor Company for use in its new sports coupe. The engineers have calculated the maximum horsepower for the engine to be 600HP. Nine engines are randomly selected for horsepower testing. The sample has an average maximum HP of 610 with a standard deviation of 50HP. Assume the population is normally distributed. Step 2 of 2 : Use the confidence interval approach to determine whether the data suggest that the average maximum...
High-power experimental engines are being developed by the Stevens Motor Company for use in its new...
High-power experimental engines are being developed by the Stevens Motor Company for use in its new sports coupe. The engineers have calculated the maximum horsepower for the engine to be 810HP. Nine engines are randomly selected for horsepower testing. The sample has an average maximum HP of 840 with a standard deviation of 50HP. Assume the population is normally distributed. Step 1 of 2 : Calculate a confidence interval for the average maximum HP for the experimental engine. Use a...
High-power experimental engines are being developed by the Stevens Motor Company for use in its new...
High-power experimental engines are being developed by the Stevens Motor Company for use in its new sports coupe. The engineers have calculated the maximum horsepower for the engine to be 830⁢HP. Twenty five engines are randomly selected for horsepower testing. The sample has an average maximum HP of 880880 with a standard deviation of 55⁢HP. Assume the population is normally distributed. Step 1 of 2 :   Calculate a confidence interval for the average maximum HP for the experimental engine. Use...
High-power experimental engines are being developed by the Stevens Motor Company for use in its new...
High-power experimental engines are being developed by the Stevens Motor Company for use in its new sports coupe. The engineers have calculated the maximum horsepower for the engine to be 580⁢HP. Sixteen engines are randomly selected for horsepower testing. The sample has an average maximum HP of 610 with a standard deviation of 55⁢HP. Assume the population is normally distributed. Calculate a confidence interval for the average maximum HP for the experimental engine. Use a significance level of α=0.1. Round...
A major oil company has developed a new gasoline additive that is supposed to increase mileage....
A major oil company has developed a new gasoline additive that is supposed to increase mileage. To test this hypothesis, ten cars are randomly selected. The cars are driven both with and without the additive. The results are displayed in the following table. Can it be concluded, from the data, that the gasoline additive does significantly increase mileage? Let d=(gas mileage with additive)−(gas mileage without additive). Use a significance level of α=0.05 for the test. Assume that the gas mileages...
13. A major oil company has developed a new gasoline additive that is supposed to increase...
13. A major oil company has developed a new gasoline additive that is supposed to increase mileage. To test this hypothesis, ten cars are randomly selected. The cars are driven both with and without the additive. The results are displayed in the following table. Can it be concluded, from the data, that the gasoline additive does significantly increase mileage? Let d=(gas mileage with additive)−(gas mileage without additive). Use a significance level of α=0.05 for the test. Assume that the gas...
A major oil company has developed a new gasoline additive that is supposed to increase mileage....
A major oil company has developed a new gasoline additive that is supposed to increase mileage. To test this hypothesis, ten cars are randomly selected. The cars are driven both with and without the additive. The results are displayed in the following table. Can it be concluded, from the data, that the gasoline additive does significantly increase mileage? Let d=(gas mileage with additive)−(gas mileage without additive)d=(gas mileage with additive)−(gas mileage without additive). Use a significance level of α=0.05α=0.05 for the...
A major oil company has developed a new gasoline additive that is supposed to increase mileage....
A major oil company has developed a new gasoline additive that is supposed to increase mileage. To test this hypothesis, ten cars are randomly selected. The cars are driven both with and without the additive. The results are displayed in the following table. Can it be concluded, from the data, that the gasoline additive does significantly increase mileage? Let d = (gas mileage with additive) - (gas mileage without additive). Use a significance level of α = 0.05 for the...
A major oil company has developed a new gasoline additive that is supposed to increase mileage....
A major oil company has developed a new gasoline additive that is supposed to increase mileage. To test this hypothesis, ten cars are randomly selected. The cars are driven both with and without the additive. The results are displayed in the following table. Can it be concluded, from the data, that the gasoline additive does significantly increase mileage? Let d=(gas mileage with additive)−(gas mileage without additive) . Use a significance level of α=0.05 for the test. Assume that the gas...
A major oil company has developed a new gasoline additive that is supposed to increase mileage....
A major oil company has developed a new gasoline additive that is supposed to increase mileage. To test this hypothesis, ten cars are randomly selected. The cars are driven both with and without the additive. The results are displayed in the following table. Can it be concluded, from the data, that the gasoline additive does significantly increase mileage? Let d=(gas mileage with additive)−(gas mileage without additive)d=(gas mileage with additive)−(gas mileage without additive). Use a significance level of α=0.05 for the...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT