Tourism spending. The Association of Turkish Travel Agencies reports the number of foreign tourists visiting Turkey and tourist spending by year.20 Three plots are provided: scatterplot showing the relationship between these two variables along with the least squares fit, residuals plot, and histogram of residuals.
![1132_Tourism spending.png](https://secure.tutorsglobe.com/CMSImages/1132_Tourism spending.png)
(a) Describe the relationship between number of tourists and spending.
(b) What are the explanatory and response variables?
(c) Why might we want to fit a regression line to these data?
(d) Do the data meet the conditions required for fitting a least squares line? In addition to the scatterplot, use the residual plot and histogram to answer this question.