1.Please give the equation representing each of however many subgroups are implied by the regression results in the small model.    2.Please substantively interpret the coefficients of the two independent variables in the small model.   Please explain

Can a causal relationship be established between a variable y and a variable x by running the following regressions: i) y = f(x) and ii) x = f(y). Explain in less than 75 words.

The Wall Street Journal asked Concur Technologies, Inc., an expense management company, to examine data from  million expense reports to provide insights regarding business travel expenses. Their analysis of the data showed that New York was the most expensive city. The following table shows the average daily hotel room rate () and the average amount spent on entertainment () for a random sample of  of the  most-visited U.S. cities. These data lead to the estimated regression equation . For these data . Click on the datafile logo to reference the data. Use Table 1 of Appendix B. full question attached in ss thanks for help aprpeicated aigjrowoirj

The quadratic regression equation shown below is for a sample of n=22. a. Predict Y for X1=3.     ​(Type an integer or a​ decimal.)