Mar 23, 2016
Yummm Starbucks Coffee
YummmStarbucks CoffeeBy Nicole Rodi and Brittney Ferrari
About Starbucks Starbucks Mission: To inspire and nurture the human spirit one person, one cup, and one neighborhood at a time.Environmental Mission: Starbucks is committed to a role of environmental leadership in all facets of our business.Starbucks Gives: The Starbucks Foundation, Social Investments, Ethos Water, Regional and Local DonationsDiversity at Starbucks: Starbucks has made a business out of human connections, community involvement and the celebration of cultures.Starbucks DrinksBrewed CoffeeCoffee of the WeekPike Place Roast
FrappuccinoCaramel, Vanilla Bean, Mocha
Tazo TeaChai Tea LatteHot/Iced Tea
Classic FavoritesHot Chocolate
OtherFood (Bagel, Scone, Fruit)Gift CardsMerchandise (Cups, Bagged Coffee)WaterDrink SizesKids = Kids
Tall = Small
Grande = Medium
Venti = Large
Observational studyWe wanted to compare the gender, drink size and drink selection of people who drink Starbucks coffee. The categories we used for drink selection were identical to those of Starbucks.
We went to 4 Starbucks:Montgomery Mall, 6-8 pm MondayDoylestown N Main Street, 7-9 pm WednesdayDoylestown Main Street, 7:30- 9:30 am FridayWarrington Barn Plaza, 7-9 pm Sunday
We observed every costumer who came in during the 2 hour interval.
This was the most effective way to randomize our study
Chi- Square for AssociationTest 1Exploratory Data AnalysisThe mens drink size selection is right skewed, indicating that men preferred smaller sizes.The smaller drinks of men might be a result of their desire for a quick pick me up rather than a delicious treat.The womens drink selection is more evenly distributed, showing that there was no clear preference in size.This even distribution could be due to the fact that most women choose the drink and size that they are in the mood for at that moment in time. Chi Square AssumptionsState
2 independent SRSAll expected counts are greater than or equal to 5Check
2 independent SRS- assumedThis condition was not met however we proceeded with the test
Chi- Square Test for Association: Gender vs. Drink SizeHo: There is no association between gender and drink sizeHa: There is an association between gender and drink
We fail to reject Ho because the P-value of .27 >= 0.05. There is sufficient evidence that there is no association between gender and size of drink.
Chi- Square for Association Test 2 Exploratory Data AnalysisThe espresso category was ordered the most in every drink size. This is probably because it has the largest amount of drink options.Classic favorites had the least amount of orders. Probably because people would rather get coffee at Starbucks.
Chi- Square for Association: Drink Size vs. Drink Selection
Ho: There is no association between drink size and drink selectionHa: There is an association between drink size and drink selection
We fail to reject Ho because the P-value of .27 > = 0.05. There is sufficient evidence that there is no association between drink size and drink selection. 2 Proportion Z- Test: Gender and Drink SelectionExploratory Data AnalysisEspressos was ordered the most by both women and men probably because it had the largest amount of drink selection.There were more females who went to Starbucks. 2 Proportion Z-Test AssumptionsState2 Independent SRS
.1563 x 128 = 20.8437 x 128 = 108
.3458 x 107= 37.6542 x 107 = 70
Pop > 1,280Pop > 1,070
2-Proportion Z-Test: Gender and Drink SelectionWe reject the Ho because the P-value