Suppose that a well-respected study published in Child Psychology Today finds that a very high proportion of children raised by stay-at-home fathers are accepted to Harvard University. If a large number of previously working fathers quit their jobs and become stay-at-home dads, which of the following will occur, all else equal? (i) The unemployment rate will decrease. (ii) The size of the labor force will decrease. (iii) The number of unemployed people will increase. (iv) The unemployment rate will increase.

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