One waiter recorded information about each tip he received over a period of a few months working in one restaurant.

This is an app that helps the consumers predict a reasonable tip.

-tip in dollars,

-bill in dollars,

-sex of the bill payer,

-whether there were smokers in the party,

-day of the week,

-time of day,

-size of the party.

https://liujun0402.shinyapps.io/Course_Project/

## `geom_smooth()` using formula 'y ~ x'