Upload Cars04-1 data and use engine size to predict the car's length. Answer the questions.

I) For each additional 2.0 liter in engine size how much the car length will change? (10 points)

• a. It will increase by 21.44 units.
• b. It will increase by 10.7 1 units.
• c. It will increase by 154.8 units.
• d. It will increase by 176.2 units.
• e. Not applicable.

II) After performing the regression analysis you are asked to pick one number that would best answer the question: Are these two variables, engine size and car length, related or not? What is this number and why?(10 points)

• a. The number is the P-value, which in this case is very low indicating a strong probability that the two variables are related.
• b. The number is the slope and it clearly indicates the relation: For each additional liter in engine size the car's length increases.
• c. This number is R-square and since it is not close to 1 we cannot claim that these two variables are related.
• d. None of these.

III) Given a car that has engine size of 3.0 liters use regression analysis and all available information in there, in order to predict this car's length. What is your interval prediction? (10 points)

• a. [178.6, 195.4]
• b. 154.8 8.35
• c. [109.5, 179.1]
• d. 187
• e. Not applicable

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