tiffany morris matthew bradwisch carly almyourspace.minotstateu.edu/laurie.geller/the cookie... ·...

Tiffany Morris

Matthew 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

Female

Male

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 Data

Freshman

Junior

other

Senior

Sophomore

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 Sample Confidence Intervals

Preferred Sample Chart

Chips Ahoy Chewy

Chips Ahoy Crunchy

Great Value Chewy

Great 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 Preference Crunchy vs. Soft

Normal Preference Crunchy vs. Soft

Crunchy

Soft

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 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 Name 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 Data Confidence 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. Crunchy Cookie 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. Crunchy Confidence Intervals

Price per Cookie Tukey’s Test Results

Tukey’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)

Conclusion Hypotheses 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

Discussion Changes 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!

Discussion Why do you care?

Thank you!

Questions?