cs <- c(23, 19, 30, 22, 23, 29, 35, 36, 33, 25) ts <- c(430, 430, 333, 410, 390, 377, 325, 310, 328, 375) mod <- lm(ts ~ cs) # add the regression line to the scatterplot plot(cs, ts) # add the regression line to the scatterplot plot(cs, ts) abline(mod) test_predefined_objects("mod") test_function("plot") test_function("abline")