Tariffs refer to
a refusal to purchase or exchange products or services with another nation unless certain financial or ideological requirements have been satisfied.
government taxes on products or services entering a country that primarily serve to raise prices on imports.
government payments to companies or industries that primarily serve to create competitive advantage for domestic products.
a minimum requirement for the purchase between two or more nations of products or services.
a restriction placed on the amount of a product allowed to enter or leave a country.

Sales at a fast-food restaurant average $6,000 per day. the restaurant decided to introduce an advertising campaign to increase daily sales. to determine the effectiveness of the advertising campaign, a sample of 49 days of sales were taken. they found that the average daily sales were $6,300 per day. from past history, the restaurant knew that its population standard deviation is about $1,000. if the level of significance is 0.01, have sales increased as a result of the advertising campaign? multiple choicea)fail to reject the null hypothesis.b)reject the null hypothesis and conclude the mean is higher than $6,000 per day.c)reject the null hypothesis and conclude the mean is lower than $6,000 per day.d)reject the null hypothesis and conclude that the mean is equal to $6,000 per day.expert answer