4009 see the attachment, please

You have monthly sales (in thousands of South African's rand - the currency of the Southern African Common Monetary Area) of a shop which opened in January 1987 and sells gifts, souvenirs, and novelties. The shop is situated in a beach resort town of South Africa. The sales volume varies with the seasonal population of tourists. There is a large influx of visitors to the town at Christmas and for the local surfing festival, held every March since 1988. The data ends in December 1992. You use R to fit a regression model to the logarithms of these sales data with a linear trend, 12 seasonal dummies and a "surfing festival" dummy variable (1 for March and 0 otherwise). Use the R output to answer the following questions. 1) Interpret the following coefficients: trend, season12 and surf. 2) How many coefficients are statistically significant at the 5% level? Explain how you arrived at this number. Coefficients: Estimate Std. Error t value Pr(>|t/) trend 0. 020560 0. 001045 19.67