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Moldy Strawberries: Organic vs. Non-Organic
2
Conclusions
- Fail to reject the null hypothesis
- No evidence that organic strawberries mold faster than non-organic strawberries
- Results generalized to all store bought strawberries in the USA
- Errors: data collection
- Difficulties: time constraint
- Improvements: sample more brands and from different stores, place in damp area
- Major: Environmental Studies/Biology
- First Year Honors Program
- Summer: working at Camp Keystone; camping in Yosemite
- Aeronautical Engineering
- Summer traveling
Inference
Population: Store bought strawberries grown in the USA.
Parameter: Average days until strawberry grows mold.
We will conduct a 2-sample t-test for means.
Conditions
SRS- Randomly chosen strawberries.
Independence- Sample is less than 10% of population.
Normality- Large sample. Robust sample t-test.
Hypothesis
The Data
H0: μA = μB the mean amount of days for the organic strawberries (A) to mold is equal to the mean amount of days it took for non-organic strawberries (B) to mold.
HA: μA ≤ μB the mean amount of days for the organic strawberries (A) to mold is less than the mean amount of days for non-organic strawberries (B) to mold.
t=0.544 p=0.71 df=32.13
Since the p-value of 0.71 is significantly larger than the α=0.05 significance level, we fail to reject the null hypothesis. We do not have statistically significant evidence that organic strawberries mold faster than non-organic strawberries.
Do organic strawberries mold faster than non-organic strawberries?
Data Collection
- 2 brands per strawberry type, not washed, 15 from each brand placed on towel, 30 organic and 30 non-organic strawberries in total
- Strawberry removed when mold appears
- Recorded how many strawberries molded every 12 hours
- Randomized brands chosen and boxes chosen from each brand (Florida and California)
- Unavoidable bias: when and where strawberries were packaged, damage on strawberries from transport, human error
- Observational Study
- Explanatory Variable: type of strawberry
- Response Variable: time until first mold appearance
- Ho: μA = μB A= organic
- Ha: μA ≤ μB B= non-organic