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A travel agent wanted to determine if the average price for a hotel in Seattle was greater than 290 dollars. He took a random sample of 15 hotels and found their rates for a standard room. The sampl mean price was 270 dollars. What would be the appropriate null and alternative hypothesis? O Ho: ybar= 270 vs. Ha: ybar > 270 Ho: mu = 290 vs. Ha: mu > 290 O Ho: ybar = 290 vs. Ha: ybar > 290 O Ho: mu = 270 vs. Ha: mu > 270