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6. "JD Power Consumer report\" reported that the average waiting time of rental car in airport in 2004 was '19 min. In 2005, we sampled 20 traveler and asked to them, "how much time he/she waited for rental car?". Mean of 15 min. and Standard Deviation of 7 min. was answered. Can we conclude that the average waiting time is decreased? (alpha=0.05) (10 points) 7. The post anesthesia care area (recovery room) at Ajou Hospital, was recently enlarged. The hope was that with the enlargement the mean number of patients per day would be more than 25. A random sample of 15 days revealed the following numbers of patients. At the .05 significance level, can we conclude that the mean number of patients per day is more than 25? (10 points) 25 27 25 26 25 28 28 27 24 26 25 29 25 27 24 8. Who spends more on their vacations, golfers or skiers? To help answer this question, a travel agency surveyed 15 customers who regularly take their spouses on either a skiing or a golfing vacation. The amounts spent on vacations last year are shown here. Can we infer that golfers and skiers differ in their vacation expenses? (alpha=0.05) (10 points) Golfer 3,000 4,000 4,000 2,000 3,000 3,000 5,000 4,000 Skier 4.000 4,000 3.000 5.000 6.000 4.000