This preview shows page 1. Sign up to view the full content.
Unformatted text preview: ecting it, and the major question to be
This tipping data is a great start for a data analysis course because it is clearly a pilot
study. There is no temptation to make inference from the data, and emphasis should
be on poking around the data to formulate hypotheses, that might be used to design
a later study. Tips are also something that we all confront in our daily life, so we can
relate to the data, and use personal experience to digest some of the ﬁndings.
9 Dianne Cook, Statistics Department, Iowa State University 1
Tips Food server’s tips in restaurants may be inﬂuenced by many factors including the nature of the restaurant,
size of the party, table locations in the restaurant, ... To make appropriate assignments (which tables the food
server waits on) for the food servers, restaurant managers need to know what these factors are. For the sake
of staﬀ morale they must avoid either the substance or appearance of unfair treatment of the food servers,
for whom tips are a major component of pay. In one restaurant, a food server recorded the following data
on all customers they had served during a interval of two and a half months in early 1990. The restaurant,
located in a suburban shopping mall, was one of a national chain and served a varied menu. In observance
of local law the restaurant oﬀered seating in a non-smoking sections to patrons who requested it. The data
was assigned to those days and during those times when the food server was routinely assigned to work.
The data available are:
SIZE Total bill, including tax, in dollars
Tip in dollars
Sex of person paying bill (M, F)
Smoker in party? (No, Yes)
Thu, Fri, Sat, Sun
Size of the party The major question to be answered is “What factors aﬀect the tip rate?” The start of a case study needs a title, author, and a description of the data which
gives the source, list of variables, reasons for collecting it, and the major question to b...
View Full Document
This note was uploaded on 02/06/2014 for the course STAT 503 taught by Professor Staff during the Fall '08 term at Iowa State.
- Fall '08