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Question 9 [1 point) We run a regression studving the effects of raining on the sales of ice cream. We have a dataset of the sales of ice cream and the weather from June to October in the past 20 vears. We consider the following model: Sales of Ice Creami : 3.; + [31 Amount of Rain:- + 11.1- where the subscript i denotes the day i. Denote the OLS estimate for #31 as #31 . Suppose we know that the dailv average temperature also affects the sales of ice cream: the warmer, the better the sales of ice cream. We also know that #31 I} 51. What is the correlation between the dailvr average temperature and the amount of rain? 0 To tell the sign of the correlation, more information is needed. 0 Positive 0 Negative 0 Zero