Tiffany Morris
Matthew Bradwisch
Carly Alm
Samples

Chips Ahoy! Brand
 Chewy
 Crunchy
Great Value Brand
Chewy
Crunchy
Hypotheses

 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.
Data Collection

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
Presentation of Data

Of the 48 participants:
Pie Chart of Gender
Category
 27 males and 21 females
Female
Male
 Mean age 21 years
 Range 18 to 55 years old
43.8%
56.3%
Presentation of Data

Presentation of Data

Participant Status:
 9 freshmen
 6 sophomores
Grade Level
12.5% 18.8%
29.2%
Freshman
Junior
other
Senior
Sophomore
25.0%
 2 juniors
 14 seniors
Category
14.6%
 7 other which represented graduate students,
faculty, and staff of Minot State University
Preferred Sample
Data

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
Confidence Intervals

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 Sample Chart

Preferred Sample
Category
20.8%
18.8%
18.8%
41.7%
Chips Ahoy Chewy
Chips Ahoy Crunchy
Great Value Chewy
Great Value Crunchy
Normal Preference
Crunchy vs. Soft

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 Preference
Crunchy vs. Soft

Pie Chart of Normally Prefer
Category
Crunchy
Soft
29.2%
70.8%
Preferred vs. Chosen

 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

Gender Differences
Name Brand vs. Generic

 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 sample
We 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 Differences

Cookie Sample Data

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
Means for:
Cookie Weight
Chips Ahoy! Chewy
Chips Ahoy! Crunchy
Great Value Chewy
Great Value Crunchy
13.8 grams
11.2 grams
13.6 grams
10.9 grams
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
Chip Weight
$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 pvalue of 0.995
 Chips per cookie ratio is not significantly
different between brands, in the population.
Cookie Weight Data
Confidence Intervals

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 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
Chips
Great
Chips
Great
N
Ahoy Chewy
10
Value Chewy
10
Ahoy Crunchy 10
Value Crunchy 10
Mean Grouping
13.800 A
13.600 A
11.200
B
10.900
B
Means that do not share a letter are significantly different.
Cookie Weight Data
Tukey’s Significance

 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
Chewy Vs. Crunchy
Cookie Weight Data

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. Crunchy
Confidence Intervals

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
Price per Cookie
Tukey’s Test Results

Tukey’s Test Results:
Level
GV Chewy price per cooki
GV Crunchy price per coo
CA Chewy price per cooki
CA Crunchy price per coo
Individual 95% CIs For Mean Based on
Pooled StDev
---+---------+---------+---------+-----(---*---)
(---*---)
(---*---)
(---*---)
---+---------+---------+---------+-----0.060
0.070
0.080
0.090
Grouping Information Using Tukey Method
CA
GV
CA
GV
N
Chewy price per cookie
10
Chewy price per cookie
10
Crunchy price per cookie 10
Crunchy price per cookie 10
Mean Grouping
0.087121 A
0.074680
B
0.072165
B
0.060928
C
Means that do not share a letter are significantly different.
Conclusion
Hypotheses Results

 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)
Discussion
Changes for Improvement

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
Discussion
Why do you care?

 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!
Questions?

Thank you!