Stephen RaineyKevin

Weigand

About Chipotle Mexian Grill About Chipotle Mexian Grill Founded in 1993 by Steve Founded in 1993 by Steve

EllsElls Denver, ColoradoDenver, Colorado Smoked, dried jalapeño Smoked, dried jalapeño

pepperpepper Known for “large burritos”Known for “large burritos” Organic Ingredients Organic Ingredients McDonald’s from ’98 to McDonald’s from ’98 to

’06’06 Net income $126 millionNet income $126 million Kevin and Stephen Kevin and Stephen

“regulars”“regulars”

What We want to FindWhat We want to Find

Is chipotle male dominate, over Is chipotle male dominate, over priced, and a burrito only lunch priced, and a burrito only lunch option? (That’s the stereotype were option? (That’s the stereotype were trying to prove wrong)trying to prove wrong)

How We Collected DataHow We Collected Data

Went to three Went to three different Chipotle’sdifferent Chipotle’s– Valley Square, Willow Valley Square, Willow

Grove, North WalesGrove, North Wales Varied days/timesVaried days/times Asked for permission- Asked for permission-

listened in on orderslistened in on orders Recorded into chartsRecorded into charts Recorded pricesRecorded prices

Distribution of MeatsDistribution of Meats Chicken (46%)Chicken (46%) Steak (20%)Steak (20%) Barbacoa (12%)Barbacoa (12%) Carnitas (18%)Carnitas (18%) None (4%)None (4%) Kevin- ChickenKevin- Chicken Stephen- CarnitasStephen- Carnitas http://www.chipotle.co

m/en-US/menu/ingredients/ingredients.aspx

Gender Vs. Meal Gender Vs. Meal Exploratory Data Exploratory Data

AnalysisAnalysis

BB

uO

ST

Frequency of Meal_TypeGender

4 8 12 16 20F

0 4 8 12 16 20M

count

Collection 1 Bar Chart

BowBowll

BurrBurritoito

OthOtherer

SalaSaladd

TacTacosos

TotaTotall

FemFemaleale

55 1414 00 66 44 2929

MaleMale 55 2121 22 44 88 4040

TotalTotal 1010 3535 22 1010 1212 6969

-Male and Female most common order is Burrito at 35/69-No Females ordered other-The average of female burritos is 48.28% and male is 52.5%

Chi-Square Test of HomogenityChi-Square Test of Homogenity(Gender vs. Meal Type)(Gender vs. Meal Type)

Ho: The distribution of Gender and Meal Type is distributed uniformlyHa: The distribution of gender and Meal type is not distributed uniformly.

Conditions

1). Categorical Data? 1). Yes

2). 2 Ind SRS? 2). Yes, Stated

3). All expected cell counts 3). No, 4 of 10 are greater than 5? not but we will continue anyway

FemaleFemale MaleMale

BowlBowl 5 (4.2)5 (4.2) 5 (5.8)5 (5.8)

BurritoBurrito 14 14 (14.7)(14.7)

21 21 (20.3)(20.3)

OtherOther 0 (0.8)0 (0.8) 2 (1.2)2 (1.2)

SaladSalad 6 (4.2)6 (4.2) 4 (5.8)4 (5.8)

TacosTacos 4 (5.0)4 (5.0) 8 (7.0)8 (7.0)

Observe and Expected Data TableExpected in Parenthesis

Conditions Met - Conditions Met - χ χ² Test of ² Test of Homogeneity Homogeneity

468.3...8.5

)8.55(

2.4

)2.45()( 2222

Exp

ExpObs

48.04|468.32 dfP We fail to reject that the distribution of gender and meal type is distributed uniformly because the p-value of 0.48 is greater than α= 0.05.

We have sufficient evidence that the true distribution of gender and meal type is distributed uniformly.

Total Meal PricesTotal Meal Prices

5

10

15

20

25

30

35

Price_

0 2 4 6 8 10 12 14 16

Collection 1 Histogram

MeanMean 7.9657.965

MinimumMinimum 2.952.95

Q1Q1 7.57.5

MedianMedian 7.757.75

Q3Q3 8.98.9

MaxMax 12.9512.95

Standard Standard dev.dev.

1.641.64

The histogram is unimodal, and roughly symmetric. There is an outlier at $2. 95 and $4.50 (LF=7.5-1.5(8.9-7.5) because it is lower than $5.40, the lower fence. There is an outlier at $12.95 and $11.60 (UF= 8.9+1.5(8.9-7.5) because they are greater than $11, the upper fence.

5 # Summary

1 Proportion T-Interval1 Proportion T-Interval N = 69N = 69 µ = 7.96449µ = 7.96449 Confidence = 95%Confidence = 95%

Conditions

1). SRS 1). Stated

2). Population ≥ 10n 2). Yes there are more than 690 chipotle customers3).Normal population 3). Yes n is > 30 or n ≥ 30 (69)

Conditions Met- Student t distribution- Conditions Met- Student t distribution- 1 Sample t Interval1 Sample t Interval

x ± t*(s/ n)x ± t*(s/ n)

7.96 ± t*(1.64/ 8.31)7.96 ± t*(1.64/ 8.31)

( 7.57104, 8.35794)( 7.57104, 8.35794)

We are 95% confident that the true We are 95% confident that the true mean of total prices at Chipotle is mean of total prices at Chipotle is between 7.57 and 8.36 dollars per meal. between 7.57 and 8.36 dollars per meal.

Meal vs. Meal vs. Meal TypeMeal Type

BB

uO

ST

Frequency of Meal_TypeMeal

5 10 15 20 25Dinner

0 5 10 15 20 25Lunch

count

Collection 1 Bar Chart

DinnerDinner LunchLunch TotalTotal

BowlBowl 66 44 1010

BurritoBurrito 1313 2222 3535

OtherOther 00 22 22

SaladSalad 66 44 1010

TacosTacos 66 66 1212

TotalTotal 3131 3838 6969

-Again, the burrito is the most popular at dinner and lunch

- The same amount of tacos were ordered at lunch and dinner

-At dinner there was no other

-The same amount of bowls, salads, and tacos were ordered at dinner (6)

Chi-Square Test of independenceChi-Square Test of independence(Meal vs. Meal Type)(Meal vs. Meal Type)

Observe and Expected Data TableExpected in Parenthesis

DinnerDinner LunchLunch

BowlBowl 6 (4.5)6 (4.5) 4 (5.5)4 (5.5)

BurritoBurrito 13 (5.7)13 (5.7) 22 22 (19.3)(19.3)

OtherOther 0 (0.9)0 (0.9) 2 (1.1)2 (1.1)

SaladSalad 6 (4.5)6 (4.5) 4 (5.5)4 (5.5)

TacosTacos 6 (5.4)6 (5.4) 6 (6.6)6 (6.6)

Ho: There is no association between meal and meal typeHa: There is an association between meal and meal type.

Conditions

1). Categorical Data? 1). Yes

2). 2 Ind SRS? 2). Yes, Stated

3). All expected cell counts 3). No, 4 of 10 are greater than 5? not but we will continue anyway

Conditions Met - Conditions Met - χ χ² Test of ² Test of Independence Independence

45.4...5.5

)5.54(

5.4

)5.46()( 2222

Exp

ExpObs

35.04|45.42 dfP We fail to reject that there is no association between meal and meal type because the p-value of 0.35 is greater than α= 0.05

We have suffiencient evidence that there is no association between meal and meal type.

Personal OpinionsPersonal Opinions Chipotle is more of a male Chipotle is more of a male

restaurantrestaurant Burritos #1 MealBurritos #1 Meal Not overpricedNot overpriced Stephen: BurritoStephen: Burrito

– CarnitasCarnitas– No beansNo beans– No GuacNo Guac– SalsaSalsa– CheeseCheese– CornCorn

Kevin: BurritoKevin: Burrito– ChickenChicken– BeansBeans– GuacGuac– Salsa Salsa

Better than Moe’s!Better than Moe’s!

Bias and ErrorBias and Error

Possibly misheard Possibly misheard an orderan order

Added up prices Added up prices wrongwrong

Groups of people Groups of people with similar likes or with similar likes or trying same thingtrying same thing

ConclusionConclusion

No association between meal and meal No association between meal and meal type, we cannot say that Chipotle is type, we cannot say that Chipotle is actually a lunch burrito placeactually a lunch burrito place

It is not overpriced because average cost It is not overpriced because average cost is only $7.95 per meal, which is less than is only $7.95 per meal, which is less than $10 and just $1.60 more than the basic $10 and just $1.60 more than the basic meal availablemeal available

It cannot be said that Chipotle is only a It cannot be said that Chipotle is only a male place, there was a fairly even male place, there was a fairly even distribution between males and femalesdistribution between males and females

Whenever I come to Philadelphia, I always eat a nice Chipotle burrito, and

the Eagles.