In an attempt to reduce the use of gasoline, a city imposed a $2.50 per gallon tax on gasoline in 2005. A researcher working for the city, located data on annual gallons used for the 5 years leading up to the gas tax (to provide a baseline) and located data for the 5 years after the start of the gasoline tax (to show the consumption pattern after the tax). Which of the following best describes this study design?
a. A-B-A-B designb. Changing-criterion design c. Interrupted time-series designd. Regression-discontinuity design

answer; /// (culture);

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the federal government of the united states was established by the constitution. us is a presidential republic. the president is head of state, head of government and of a two party legislative and electoral system. the supreme court balances the powers of the federal and the state government. yhe executive branch is headed by the oresident. there are two chambers of congress, the senate and the house of representatives. judicial power is exercised by the judicial branch (or judiciary), comprised of the supreme court and lower federal courts. the judiciary's function is to interpret the   constitution as well as the federal laws and regulations.