Monday, August 1, 2011

The Phenomenon (Human Reaction to choices)

Since our group is curious to find out about the time taken for a person to choose. We decided to work in this area. During our research, we found out that Hick's Law proposed that the time taken for a human to choose something increases exponentially as the number of choices given to that person increases. Thus Logarithms is involved.

We decided to investigate in this area. And we found that the Hick's Law is the most suitable to calculate this phenomenon. To prove that we understand this topic on logarithms and to prove that Hick's Law is true, we did an experiment with several friends. (As this is all about human behaviour and human reaction)

We used the formula in Hick's Law, which is T=b x log2 (n+1).

To refresh your memories, T is the time taken to choose from a variety of choices. n is the number of choices given to the person. However, there is one more constant, which is the b. We concluded that b varies from person to person as every human is different. So, how did we execute this 'experiment'?

First we had to find the constant b. We formulated a question for our friend. (Anonymous to protect his identity -- Stated in the report) We gave decided to give him 4 choices of fruits to choose from. (Since we do not know the constant b, we had to work backwards).

Q: Choose with carefully consideration and do not be bias in this test. What would you choose? Orange, Apple, Pineapple or Honeydew?

A: (After 5 seconds) Apple.

And we worked backwards to find out his constant b.

T=b x log2 (4+1) --> 5s=b x log2 (5) --> 5/log2 (5) = b
And b is 2.15338279.

And we can continue with our experiment! Next, we formulated another question. But this time, we gave him 6 choices to choose from. Before we even asked him the question, we calculated and predicted the time he will take to choose from the 6 items.

T=b x log2 (6+1)
T=2.15338279 x log2 (7)
T=6.046559356

Round down to 6s.

Q: Choose among these drinks. Peach Tea, Green Tea, Ice Lemon Tea, H-Two-O, Bubble Tea or Apple Tea?

A: (After 7 seconds) Bubble Tea.

He took 7 seconds to answer this question. Although the answer and the predicted answer was not exactly the same, it was a difference of 1 second. Give and take 1~3 seconds for human reaction, he is in the range of our predicted answer and we have successfully completed our experiment!

However, we were not happy with just 2 questions. We formulated another questions. This time, we gave him 9 choices to choose from.
Again, the formula -->
T=b x log2 (9+1)
T=2.15338279 x log2 (10)
T=7.153382789

Predicted Time taken for him to choose from 9 choices is about 7s.

Q: Choose a brand of a car. Toyota, Honda, Ford, Fiat, Chevrolet, Volkswagon, Mitsubishi, Nissan, Proton.

And indeed, this time, he took 7 seconds to answer!

Isn't it amazing!?

pH Scale (Real-life Application) -- Continued

Here's another real-life application we did to confirm this phenomenon! Again, we experimented with a drink. But this time we experimented with orange juice.

So again, .
Hydromium Ions in orange juice is 3.2 x 10^-4

Thus the pH level of the Orange Juice is about 3.5. We have also crossed referenced our findings with other dietary websites and confirmed that the pH level of orange juice is indeed 3.5

Real-Life Application of pH Scale

To prove that the pH Scale formula is correct and to relate what we have learnt about logarithms into reality, we have made this small little experiment.

For starters, we experimented on a drink that is very familiar to us -- Lemon Juice.
As we all know, Lemon is acidic. But how acidic is it? Let's find out!

By using the formula , we sub in some numbers:
Lemon has a Hydronium Ion number of 3.2 x 10-3.

Thus

pH = -log(3.2 x 10-3)

pH = 2.494

Round up to 2.49

Therefore the pH level of the Lemon Juice is 2.49. We cross-referenced it to several websites and confirmed that the acidity of Lemon juice is 2.49.

http://www.indiacurry.com/chutney/foodphlevel.htm

http://www.everydiet.org/diet/acid-alkaline-diets

http://answers.ask.com/Science/Chemistry/what_is_the_ph_level_of_lemon_juice