Determine whether the study described is a randomized experiment or an observational study. A nutritionist has developed a new healthier meatloaf recipe. The nutritionist selects a sample of people to try either the new or traditional meatloaf. The people choose which meatloaf to eat. The nutritionist polls the people individually about their opinion of the meatloaf.

a. Randomized experiment
b. Observational study

Let us imagine that the number of automobile accidents in a certain region are related to the regional number of registered automobiles in tens of thousands (b1), alcoholic beverage sales in $10,000 (b2), and decrease in the price of gasoline in cents (b3). furthermore, imagine that the regression formula has been calculated as: y = a + b1x1 + b2x2 + b3x3 where y = the number of automobile accidents, a = 7.5, b1 = 3.5, b2 = 4.5, and b3 = 2.5 calculate the expected number of automobile accidents for a football weekend if the region has 25,000 registered vehicles, $75,000 worth of beer is sold, and a gas war causes a 10 cent drop in a gallon of gas.