Which of the following hypotheses is a one-tailed test? Group of answer choices

a. Hybrid cars get better gas mileage than traditional cars
b. There is a difference in the gas mileage of cars and trucks
c. There is no difference in gas mileage among two-door and four-door vehicles
d. There is a relationship between the number of miles to one's job and the gas mileage associated with his or her chosen car
e. All of the above are one-tailed tests

Which is cheaper: eating out or dining in? the mean cost of a flank steak, broccoli, and rice bought at the grocery store is $13.04 (money. msn website, november 7, 2012). a sample of 100 neighborhood restaurants showed a mean price of $12.75 and a standard deviation of $2 for a comparable restaurant meal. a. develop appropriate hypotheses for a test to determine whether the sample data support the conclusion that the mean cost of a restaurant meal is less than fixing a comparable meal at home. b. using the sample from the 100 restaurants, what is the p-value? c. at a = .05, what is your conclusion? d. repeat the preceding hypothesis test using the critical value approach

Suppose that fixed costs for a firm in the automobile industry (start-up costs of factories, capital equipment, and so on) are $5 billion and that variable costs are equal to $17,000 per finished automobile. because more firms increase competition in the market, the market price falls as more firms enter an automobile market, or specifically, , where n represents the number of firms in a market. assume that the initial size of the u. s. and the european automobile markets are 300 million and 533 million people, respectively. a. calculate the equilibrium number of firms in the u. s. and european automobile markets without trade. b. what is the equilibrium price of automobiles in the united states and europe if the automobile industry is closed to foreign trade? c. now suppose that the united states decides on free trade in automobiles with europe. the trade agreement with the europeans adds 533 million consumers to the automobile market, in addition to the 300 million in the united states. how many automobile firms will there be in the united states and europe combined? what will be the new equilibrium price of automobiles? d. why are prices in the united states different in (c) and (b)? are consumers better off with free trade? in what ways?

Question 3 options: ps.55 four corners is an ibc company that sells delicious navajo tacos in the crossroads food court. part of their success can be attributed to the freshly fried indian bread that is used not only for the tacos, but also for dessert items. as demand grows the fry-bread process is becoming a bottleneck. operations management for the company is looking at two different process options to replace the highly manual process currently being used. option 1 (medium automation) would cost $175 to implement whereas option 2 (high automation) would cost $350. with option 1 the variable cost per fry bread produced would be $0.20. the variable cost for option 2 would be $0.09 per fry bread. at what volume (demand) of fry breads is the cost for the two options the same? (display your answer to two decimal places.)