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Tip$

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    Tip$ Tip$ Presentation Transcript

    • Bill Guerin
      &
      Justin Astrin
    • Background
      Tipping in restaurants
      In 2003, tips generated $151 billion
      Questions to be raised
      Why do we tip after we pay a bill?
      What factors attribute to the size of a tip?
      What is considered to be an average tip?
    • Foundation
      Food server collected data over the course of 2 ½ months
      Total Amount of Bill
      Amount of the Tip
      Gender of Party
      Smoker or Non-Smoker
      Day of the Week
      Time of Day
      Size of Party
    • Average Tips as a Percent of Total Bill
      Male
      14.89%
      Smoker
      15.40%
      Party of 1-3
      15.09%
      Female
      15.69%
      Non Smoker
      15.01%
      Party of 4-6
      15.40%
    • Male vs. Female
    • Smoker vs. Non Smoker
    • Size of Party Comparison
    • Hypothesis Test
      Essential Figures
      Sample Size: 244 observations
      Sample Mean: $3.00 tip
      Reference Value: 15% tip
    • Gender
      Does gender have an impact on percent tipped?
      Null: Same gender has a negative impact on percent of bill tipped (15% or less)
      Alternative: Opposite gender has a positive impact on percent of bill tipped (greater than 15%)
      Conclusion: Reject Null!
      Same gender does not have a negative impact on percent of bill tipped
    • Smoking Preference
      Does smoking preference have an impact on percent tipped?
      Null: A preference to smoke has a negative impact on percent tipped (15% or less)
      Alternative: A preference to not smoke has a positive impact on percent tipped (greater than 15%)
      Conclusion: Reject Null!
      A preference to smoke does not have a negative impact on percent of bill tipped
    • Size of Party
      Does the size of the party impact the percent tipped?
      Null: Party size of 3 or less has a negative impact on percent of bill tipped
      Alternative: Party size of 4 or more has a positive impact on percent of bill tipped
      Conclusion: Reject Null!
      A party size of 3 or less does not have a negative impact on percent of bill tipped
    • Conclusions
      Gender, Smoking Preference, Size of Party
      Insight
      Descriptions of small discrepancies:“keeping the change”
      Look at method of payment
      Matt Parrett states how cash tipping and credit card tipping can differ
      Look at more qualitative data
      Michael Lynn states how non-verbal behaviors and likeability can impact a tip
    • Question for the Audience
      Why do you tip? and What factors influence your tip?