The Cookie Competition

Tiffany MorrisMatthew Bradwisch

Carly Alm

Chips Ahoy! Brand Chewy Crunchy

Great Value Brand Chewy Crunchy

Samples

Chips Ahoy! would be the preferred brand

Normally preferred type would be the same as chosen sample type (Soft vs. Chewy)

We believed the name brand cookie would contain more chocolate chips per cookie and have a higher price per cookie.

Hypotheses

Experimental data collection

Selection of sample cookies from population

Weights of cookies as a whole (grams) Separation of cookie dough and chips Chips weighed separate (grams)

Data Collection

Survey Data

4 sample cookies to chose from 48 surveys were completed Survey located on 1st floor of Old Main Survey participants were diverse

Data Collection

Of the 48 participants: 27 males and 21 females Mean age 21 years Range 18 to 55 years old

Presentation of Data

FemaleMale

Category

56.3%43.8%

Pie Chart of Gender

Presentation of Data

Participant Status:

9 freshmen 6 sophomores 2 juniors 14 seniors 7 other which represented graduate students,

faculty, and staff of Minot State University

Presentation of DataFreshmanJuniorotherSeniorSophomore

Category

12.5%

29.2%

14.6%

25.0%

18.8%

Grade Level

Of the 48 participants:

20 chose Chips Ahoy! Crunchy 10 chose Great Value Crunchy 9 chose Chips Ahoy! Chewy 9 chose Great Value Chewy

Sample Winner - Chips Ahoy! Crunchy

Preferred Sample Data

We are 95% confident that, in the population of MSU students and faculty

27.7% to 55.6% would prefer Chips Ahoy! Crunchy 9.3% to 32.2% would prefer Great Value Crunchy 7.7% to 29.8% would prefer Chips Ahoy! Chewy 7.7% to 29.8% would prefer Great Value Chewy

Preferred SampleConfidence Intervals

Preferred Sample

ChartChips Ahoy ChewyChips Ahoy CrunchyGreat Value ChewyGreat Value Crunchy

Category

20.8%

18.8%41.7%

18.8%

Preferred Sample

Of the 48 participants

14 or 29.2% normally preferred crunchy 34 or 70.8%normally preferred soft

68% of those that normally preferred soft cookies chose a crunchy sample

50% of those that normally preferred crunchy cookies chose a soft sample

Normal PreferenceCrunchy vs. Soft

Normal PreferenceCrunchy vs. Soft

CrunchySoft

Category

70.8%

29.2%

Pie Chart of Normally Prefer

We are 90% confident that of those who normally

preferred soft cookies 54.45% to 80.84% would choose a crunchy sample

We are 90% confident that of those who normally preferred crunchy cookies 28% to 72% would choose a chewy sample

Test of Independence: There was sufficient evidence to suggest that normally preferred and sample chosen are independent for MSU students and faculty.

Preferred vs. Chosen

Preferred vs. Chosen

71.43% of females chose Chips Ahoy! in the

sample. 51.85% of males chose Chips Ahoy! and 48.15% of

males chose Great Value in the sampleWe are 95% confident that, in the population of MSU students and faculty,

7.4% less to 46.6% more females than males would chose Chips Ahoy!, the name brand.

Interval includes 0 No significant difference between female and

male choices

Gender DifferencesName Brand vs.

Generic

Gender Differences

Chips Ahoy! Chewy had highest

ratio of chips per cookie at 27.76% mean cookie weight of 13.8 grams price per cookie of $0.087

Cookie Sample Data

Means for: Chips Ahoy! Chewy

Chips Ahoy! Crunchy

Great Value Chewy

Great Value Crunchy

Cookie Weight

 13.8 grams 11.2 grams 13.6 grams 10.9 grams

Chip Weight  3.8 grams 2.9 grams 3.2 grams 2.5 grams

Chip to Cookie

(Weight) Ratio

27.76% 26.39% 23.60% 22.45%

Price per Cookie $0.087 $0.072 $0.075 $0.061

 

Chips per Cookie

The Chips Ahoy! brand had more chips per cookie than the Great Value brand, in our sample.

Using an Chi-square Goodness of Fit Test Chips per cookie ratio different per

brand? Using α=0.05, we got a χ²=0.0718 and

a p-value of 0.995 Chips per cookie ratio is not significantly

different between brands, in the population.

We are 95% confident that the mean cookie weights for population of each brand are

13.0 to 14.6 grams Chips Ahoy! Chewy 10.3 to 12.1 grams Chips Ahoy! Crunchy 13.1 to 14.1 grams Great Value Chewy 10.4 to 11.4 grams Great Value Crunchy

Cookie Weight DataConfidence Intervals

Cookie Weight Data Tukey’s Test Results

Tukey’s Test Results:

Individual 95% CIs For Mean Based on Pooled StDev Level -----+---------+---------+---------+---- Great Value Chewy (----*-----) Great Value Crunchy (-----*----) Chips Ahoy Chewy (----*----) Chips Ahoy Crunchy (----*-----) -----+---------+---------+---------+---- 10.8 12.0 13.2 14.4 Grouping Information Using Tukey Method N Mean Grouping Chips Ahoy Chewy 10 13.800 A Great Value Chewy 10 13.600 A Chips Ahoy Crunchy 10 11.200 B Great Value Crunchy 10 10.900 B Means that do not share a letter are significantly different.

Mean cookie weights of the chewy samples

were not significantly different from each other

Mean cookie weights of the crunchy samples were not significantly different from each other

Mean cookie weights of the chewy samples were significantly different than the crunchy samples

Cookie Weight Data Tukey’s Significance

Data Combined for Chewy vs Crunchy

Chips Ahoy! Chewy + Great Value Chewy Chips Ahoy! Crunchy + Great Value

Crunchy

Mean cookie weights 13.70 grams chewy samples 11.05 grams crunchy samples

Chewy Vs. CrunchyCookie Weight Data

We are 95% confident that, in the population of the brands, the mean cookie weights are

13.3 to 14.1 grams for chewy 10.6 to 11.5 grams for crunchy

We are 95% confident that the average cookie weight for the chewy cookies is 2.0 to 3.3 grams heavier than the crunchy cookies, in the population

Chewy Vs. CrunchyConfidence Intervals

Price per Cookie

Tukey’s Test ResultsTukey’s Test Results:

Individual 95% CIs For Mean Based on Pooled StDev Level ---+---------+---------+---------+------ GV Chewy price per cooki (---*---) GV Crunchy price per coo (---*---) CA Chewy price per cooki (---*---) CA Crunchy price per coo (---*---) ---+---------+---------+---------+------ 0.060 0.070 0.080 0.090 Grouping Information Using Tukey Method N Mean Grouping CA Chewy price per cookie 10 0.087121 A GV Chewy price per cookie 10 0.074680 B CA Crunchy price per cookie 10 0.072165 B GV Crunchy price per cookie 10 0.060928 C Means that do not share a letter are significantly different.

Chips Ahoy! Crunchy is the winner! Chips Ahoy! was more preferred brand Normally preferred is independent of chosen

sample type (Soft vs. Chewy) The chip to cookie ratios were not significantly

different Chips Ahoy! Chewy highest price per cookie Great Value Crunchy lowest price per cookie Chips Ahoy! Crunchy and Great Value Chewy not

significantly different (price per cookie)

ConclusionHypotheses Results

For the Survey: More locations around campus Different times More surveys Age confidentiality- ex. locked survey box

For Cookie Data: More accurate scale Better method for separating chips

DiscussionChanges for

Improvement

Saves you time choosing at the store! If you prefer soft cookies, you may want to try

a crunchy one. You may like it better! Chips per cookie are the same, so go ahead! Need to find a cookie everyone (or at least the

majority) will love… Chips Ahoy! Crunchy!

DiscussionWhy do you care?

Thank you!

Questions?