Your friend Josh tells you that he spends less on gas in the winter than in the

Question

Your friend Josh tells you that he spends less on gas in the winter than in the summer. He also says that he has to fill up his tank less often in the winter. (Check all that apply)

(a) Which of the following are possible hypotheses that can be formed from Joshs observations?

Assuming the gas expansion is negligible, gas prices are higher in the winter.

Assuming the gas prices are the same, cars get better gas mileage when the temperature is lower.

Assuming the gas prices are the same, Josh is a lousy driver in the summer.

Assuming the gas prices are the same, gas expands when the temperature is higher.

Assuming the gas prices are the same, Josh doesnt drive as far in the winter as he does in the summer.

(b) Which of the following pieces of information will help test your hypotheses from (a)?

Measure the volume of gas in the tank and the temperature each day.

Keep a record of the daily gas prices and the temperature.

Keep a log of the mileage driven each day and the amount of gas used.

(c) From the following, select the prediction for the BEST controlled experiment that tests your hypotheses from (a)?

If I look at Joshs driving patterns, I expect to find that he drives farther in the summer months than in the winter months.

If I measure Joshs driving distance per dollar spent on gas in the winter and in the summer, then I expect to find that its value is lower in the winter than it is in the summer.

If I measure the volume of gas in the tank, I expect to find that he has a greater volume per gallon of gas in the summer than in the winter.

If I keep track of the gas prices I expect to find that gas is more expensive in the summer than in the winter.

If I measure Joshs driving distance per dollar spent on gas in the winter and in the summer, then I expect to find that its value is higher in the winter than it is in the summer.

Explanation / Answer

PART A

Assuming the gas prices are the same, gas expands when the temperature is higher.

PART B

Measure the volume of gas in the tank and the temperature each day.

PART C

If I measure the volume of gas in the tank, I expect to find that he has a greater volume per gallon of gas in the summer than in the winter.

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