What happens when…

you eat spicy foods?

The “Scientific Method” and Experimental Design

Observations Hypothesis Testing & Experimental Design

Educated Guess Variables/Measures (Independent, Dependent) Experimental Groups

Data Analysis & Interpretation Graphing Statistics Conclusions

Future Experiments

Hot Salsa Experiment

Time(min)

Body T Δ Body T

0 0

3 BT3-BT0

6 BT6-BT0

9 BT9-BT0

12 BT12-BT0

Hot Salsa Experiment

Max Δ BT Mild Hot

S1

S2

S3

S4

S5

S6

S7

S8

S9Mean =

Hot Salsa Experiment

Statistical Analysis

Student’ t-test for the comparison of two means:

t = Y2 – Y1 / σ Y2-Y1

= mean(group1)-mean(group2) standard error for both groups

dƒ = n1+n2-2

σ Y2-Y1 =

√∑(Y1i-Y1)2 + ∑(Y2i-Y2)2/n1+n2-2

Consult table to determine p value. If p < 0.05, then reject H0.

Hot Salsa Experiment

Take-Home Points

Experiments do not prove anything.

“Negative” results are valuable.

Sample size affects experimental outcome.

Controls are necessary.

Statistics aid data interpretation.