A data frame containing the impact of three advertising medias (youtube, facebook and newspaper) on sales for 200 firms. Each observation in the dataset represent the advertising spending along with the sales in thousands of dollars for each firm. advertising spending on youtube 22 advertising spending on facebook 23 advertising spending on newspaper y sales There are in total 200 firms, which forms a population of size N = 200. #install the necessary package install.packages ("datarium") #load the dataset data("marketing", package = "datarium") #pring the first 4 observations head (marketing, 4) ## ## 1 ## 2 ## 3 ## 4 youtube facebook newspaper sales 27 12 276 53 21 182 #population size nrow(marketing) ## [1] 200 45 47 55 50 83 54 83 70 11 22 The goal is to estimate the population total of the sales of the 200 firms 200 T = 9 i=1