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Anshul K.
Tutor for four years, undergrad at prestigious Indian university.
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Physical Chemistry
TutorMe
Question:

100g hot water at 100 degree Celsius is poured into an insulated vessel containing 500g of water at room temperature (25 degree Celsius). What do you think will be the final temperature?

Anshul K.
Answer:

Let final temperature be x. Heat released by hot water = heat absorbed by cold water 100 * s (100 - x) = 500 * s *(x-25) 100-x = 5*(x-25) 100-x=5x-125 125=6x x=125/6 x=37.5 degree Celsius

Java Programming
TutorMe
Question:

Write a code snippet to obtain the following pattern : ***** **** *** ** *

Anshul K.
Answer:

for(int i=5;i>=1;i--) { for(int j=1;j<=i;j++) { System.out.print("*"); } System.out.println(); }

Statistics
TutorMe
Question:

A kidney study is looking at how well two different drug treatments (A and B) work on small and large kidney stones. Here is the success rate that was found: Small Stones, Treatment A: 93%, 81 out of 87 trials successful Small Stones, Treatment B: 87%, 234 out of 270 trials successful Large Stones, Treatment A: 73%, 192 out of 263 trials successful Large Stones, Treatment B: 69%, 55 out of 80 trials successful. Which is the better treatment, A or B?

Anshul K.
Answer:

Treatment B. Even though Treatment A had higher success rates in both small and large stones, when the whole trial is viewed as a sample space Treatment B is actually more successful: Small Stones, Treatment A: 93%, 81 out of 87 trials successful Small Stones, Treatment B: 87%, 234 out of 270 trials successful Large Stones, Treatment A: 73%, 192 out of 263 trials successful Large Stones, Treatment B: 69%, 55 out of 80 trials successful. All stones, Treatment A: 78%, 273 of 350 trials successful All stones, Treatment B: 83%, 289 of 350 trials successful. This is a classic example of Simpson's paradox.

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