The cost of 8 randomly chosen luxury vacations in Europe in 2010 were as follows: 22,300, 28,000, 31,100, 31,300, 35,400, 36,100, 36,500, 39,400. Assuming that the cost of a vacation is normally...

The cost of 8 randomly chosen luxury vacations in Europe in 2010 were as follows: 22,300, 28,000, 31,100, 31,300, 35,400, 36,100, 36,500, 39,400. Assuming that the cost of a vacation is normally distributed, compute a 90% confidence interval for the true mean cost of a European vacation in 2010.