My first analysis

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summary(cars)

     speed           dist       
 Min.   : 4.0   Min.   :  2.00  
 1st Qu.:12.0   1st Qu.: 26.00  
 Median :15.0   Median : 36.00  
 Mean   :15.4   Mean   : 42.98  
 3rd Qu.:19.0   3rd Qu.: 56.00  
 Max.   :25.0   Max.   :120.00  

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Session information

sessionInfo()

R version 3.4.0 (2017-04-21)
Platform: x86_64-pc-linux-gnu (64-bit)
Running under: Ubuntu 16.10

Matrix products: default
BLAS: /usr/lib/libblas/libblas.so.3.6.1
LAPACK: /usr/lib/lapack/liblapack.so.3.6.1

locale:
 [1] LC_CTYPE=en_US.UTF-8       LC_NUMERIC=C              
 [3] LC_TIME=en_US.UTF-8        LC_COLLATE=en_US.UTF-8    
 [5] LC_MONETARY=en_US.UTF-8    LC_MESSAGES=en_US.UTF-8   
 [7] LC_PAPER=en_US.UTF-8       LC_NAME=C                 
 [9] LC_ADDRESS=C               LC_TELEPHONE=C            
[11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C       

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     

loaded via a namespace (and not attached):
 [1] compiler_3.4.0  backports_1.0.5 magrittr_1.5    rprojroot_1.2  
 [5] tools_3.4.0     htmltools_0.3.6 yaml_2.1.14     Rcpp_0.12.11   
 [9] stringi_1.1.5   rmarkdown_1.5   knitr_1.16      git2r_0.18.0   
[13] stringr_1.2.0   digest_0.6.12   evaluate_0.10