Friday, March 9, 2012
Zagat restaurant guides publish ratings of restaurants for many large cities around the world. The review for each restaurant gives a verbal summary as well as a 0- to 30-point rating of the quality of food, d茅cor, service and the cost of a dinner with one drink and tip. For Italian restaurants in London in 2007, the food ratings had a mean of 27.60 and standard deviation of 2.70. The cost of a dinner had a mean of $81.62 and standard deviation of $17.59. The equation that predicts the cost of a dinner using the rating of the quality of food is yhat = 6.99 + 6.2x. The correlation between these two variables is 0.63. Which of the following is a correct interpretation of the slope?
A. A one unit increase in price results in a 6.2 unit increase in the average rating
B. A one unit increase in rating results in 6.2 unit increase in the average price
C. For restaurants with a rating of 0, the average price of the meal is $6.20
D. A one unit increase in rating results in a 6.99 unit increase in the price
E. None of these
Show work and answer please. *Best answer receives 5 extra bonus points!|||A one unit increase in rating results in 6.2 unit increase in the average price
In the regression equation yhat = a+bx, as x increases by 1 unit, yhat increases by 'b' units.
a=6.99
b=6.2
Here, cost = average price|||Have a look at the notable Glass Theater. Much-publicized for it's exciting quality and remarkable some of the most impressive shows, one of the most extraordinary London theaters is Glass Theater. Glass Theater is a landmark that you genuinely had to explore anteceding leaving London. Edison-new-york.com|||B is the answer
there is no work
I think the answer (B) would be better worded if the word "average" is replaced with "predicted"
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