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# Tutor profile: Farah A.

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Farah A.
Teaching Assistant at UC Berkeley for 2 years
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## Questions

### Subject:R Programming

TutorMe
Question:

How do I make a beautiful, publishable table in R?

Inactive
Farah A.

### Subject:Biology

TutorMe
Question:

Glycogen storage disease type 0 (GSD-0) is a rare disease caused by an inactive glycogen synthase enzyme. Type II diabetes is a more common disease (1 in 10 people in the US) causing “insulin resistance”, where the body’s insulin receptors don’t respond to insulin normally. Both diseases cause high glucose levels after feeding. How would you differentiate between the two diseases? A. GSD-0 would cause dysregulation of homeostasis, but type II diabetes would not. B. GSD-0 would cause a depletion in stored glycogen, but type II diabetes would not. C. GSD-0 would cause excess glucose to be secreted into the urine, but type II diabetes would not. D. GSD-0 would have normal RTK activity, but type II diabetes would not. E. People with GSD-0 would have suppression of appetite after feeding, but type II diabetes would not.

Inactive
Farah A.

### Subject:Statistics

TutorMe
Question:

Five students, Adnan, Beth, Chao, Dan, and Edmund are to be arranged in a line. How many arrangements are possible if Beth is not allowed to stand next to Dan?

Inactive
Farah A.

First, let's figure out the possible recombinations if we had no restrictions. We have 5 spaces, and 5 people to fill them: _ _ _ _ _ For the first space, we have 5 possibilities of students to pick: 5 _ _ _ _ For the second space, we have 4 possibilities, since we already took out one student for the first space: 5 4 _ _ _ You may have already spotted the pattern for the remaining spots: 5 4 3 2 1 This represents the number of possibilities for each space working from the left. Now what do we do with all these numbers? Well, think about what we are saying writing down these numbers: "There are 5 possibilities for the first space AND 4 possibilities for the second space AND 3 possibilities for the third space..." With that, we recall the cardinal rule of statistics: AND means multiply; OR means add. So here, we're going to multiply all these numbers to get: 5 x 4 x 3 x 2 x 1 = 5! = 120 possible arrangements. We would have stopped here if there were no additional restrictions, but we're told that Beth is not allowed to stand next to Dan. So, let's subtract all the different arrangements where Beth IS standing next to Dan, to get the number of arrangements where Beth is NOT standing next to Dan. To find out the number of arrangements where Beth is standing next to Dan, let's consider Beth and Dan as one unit, which means we have 4 possible spaces now: __ _ _ _ Using the principles from before, we realize that this is just 4 x 3 x 2 x 1 = 4! = 24. But wait! There are 2 possibilities within this arrangement: Beth first then Dan OR Dan first then Beth. Notice that we used OR here, so the number of arrangements where Beth is standing next to Dan is 24 + 24 = 24 x 2 = 48. Finally, we subtract the total possible arrangements (120) by the total possible arrangements where Beth is standing next to Dan (48) to get our answer: 120 - 48 = 72 possible arrangements where Beth is NOT standing next to Dan.

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