Apartment rental rates. you want to rent an unfurnished two-bedroom apartment in dallas next year. the mean monthly rent for a random sample of 10 apartments advertised in the local newspaper is $1050. assume that the monthly rents in dallas follow a normal distribution with a standard deviation of $220. find a 95% confidence interval for the mean monthly rent for unfurnished two-bedroom apartments available in dallas.

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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

Creation landscaping has 1,000 bonds outstanding that are selling for $1,280 each. the company also has 2,000 shares of preferred stock outstanding, currently priced at $27.20 a share. the common stock is priced at $37.00 a share and there are 28,000 shares outstanding. what is the weight of the debt as it relates to the firm's weighted average cost of capital?