25974 questions

What are the most important points to consider when carrying out my EPQ?

The crux of an EPQ is that it is there not only to test your skills in your chosen product (i.e. fluency, coherency, depth of analysis etc in a project where the product is an essay) but also to test many of the practical skills needed for university study, i.e. time management, ability to rethink, making suitable choices, research skills and evaluation of sources. Therefore it is extremely important that you show these practical skills. Here are some (but by no means all) ways that you can demonstrate these: Time management - be sure to create a timetable at the very beginning and update it as you go along, retaining all versions. This is not only important for your own organisation but also to demonstrate this skill to the markers. I chose to colour code my time targets as I went, so that there was a visual explanation for how and why my projected timetable developed. Attaching brief comments as you go about any unforeseen difficulties and how this affected your timing not only demonstrates the flexibility expected, but provides you with material for writing your evaluation at the end. Ability to rethink - This can be demonstrated both in your plans, and in your approach to your question. An EPQ question ought to be broad enough to ensure your work is not repetitive, but narrow enough that you are fully considering all aspects of the question. Your question should evolve as you go along, and making notes on why these changes were made is important. TOP TIP: Making mistakes is not only natural, but for EPQ it is an important part of getting marks, as the examiners want to see how you learn from these mistakes! Be sure to reference them. Research skills: Be sure to use a variety of methods of researching a topic, i.e. books from the library, newspaper articles, online articles from databases such as JSTOR, talks. Show an awareness of the variety of places you can source information from, and if you've learn a new skill i.e. search skills, be sure to talk about it in your evaluation. There are lots of websites that will be able to explain basic search skills to you if you haven't come across this topic before. Evaluation of Sources - As you are coming across these sources, it is important to be selective about which ones you choose. This can be done through a variety of criteria, i.e. - is the author an expert in their field - how recently was this written - have new advances been made - is this reliable i.e. do articles cite their sources or evidence to support their point. To achieve marks in EPQ you need to demonstrate that you are using these criteria, which can be done implicitly by explaining why you chose these sources. However, another method is to list all sources you looked at, perhaps in a table format, and make comments on whether you used them or not, and how they met each of the criteria. This can also be useful in terms of recording bibliographical information, so that if you change your mind at a late stage and choose to include a source, you have the information to cite it correctly. Therefore to summarise: - Explain your thought process for most of what you do, process makes up about 3/4 of the marks in EPQ. - Include mistakes and changes, you will not be penalised for this. - Don't be disheartened or afraid of making changes, its all an expected part of the process. - Enjoy it :)
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Rebecca B.

Answered by Rebecca, who tutored Extended Project Qualification Mentoring with MyTutor

1486 views

Show that the following system of equations has an infinite number of solutions. x+y+2z = -2; 3x-y+14z=6; x+2y=-5

Substitute values of one equation into another.  (1) x+y+2z = -2; (2) 3x-y+14z=6; x+2y=-5 (3). Substitute x in (1) and (2) from (3). We get -y+2z=3 in (1).  We get -7y+14z=21 in (3). Since (3) is (1)*7, we can conclude that the system has infinite solutions.
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Egidijus S.

Answered by Egidijus, Maths IB tutor with MyTutor

1785 views

When the polynomial 3x^3 +ax+ b is divided by x−2 , the remainder is 2, and when divided by x +1 , it is 5. Find the value of a and the value of b.

Insert the negative values of the divisors and put them into the polynomial. x-2 -> P(2) = 3*4+2a+b=2   x+1 -> P(-1)=3*(-1)+(-1)a+b=5.  22+2a+b=0 -8-a+b=0, then solve the simultaneous equations and obtain the answer: a=-10, b=-2.
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Egidijus S.

Answered by Egidijus, Maths IB tutor with MyTutor

3271 views

Name several sort algorithms of an array, their working principles and their efficency.

Bubble sort (compare two elements and switch them if one of them is higher than other, depending on ordering preference), iterate over the whole array of elements. Efficency O(n2). Insert sort, make a separate list, where you insert the elements in an ordered manner, that is start at the smallest element and go until an element that is bigger than the input or end of list and insert it before that. Efficency O(n2). Selection sort, iterate over the whole array and find the smallest element, put it into start, then iterate from smallest +1, then smallest +2. Efficency O(n2). Merge sort, split array into smaller arrays until size 1 is reached, then assume size 1 is sorted, then merge them while sorting, the sub arrays. Efficency O(n logn). Quicksort. Select a pivot point, split all elements that are larger than that to one side, smaller to other, then put the pivot, where it belongs. After do it on smaller arrays, when all is done, the arrays are merged and the final array is sorted. Efficency O(n logn).  
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Egidijus S.

Answered by Egidijus, Computing IB tutor with MyTutor

1079 views

Name the memories in the computer and rate them by the amount of space and their price. When should which be used.

Processor memory (cache), RAM (Random Access Memory), Hard memory (Hard Drive, Magnetic Tapes, Solid State drive).  Processor is fastest, ram is next, hard is slowest. Processor is most expensive, then ram, then hard. In hard memory, magnetic is cheapest, then hard drive, then solid state. Magnetic is slowest, then hard drive, then solid state.  Cheapest memory should be used for data that is used least (backups), more expensive for the one that is more often used. 
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Egidijus S.

Answered by Egidijus, Computing IB tutor with MyTutor

1012 views

Add the binary numbers 100101 and 101001 and convert them to decimal (they are unsigned integers). What are possible issues when adding the numbers?

The result is 1001110, which converted is 78. The problem that can occur is overflow, since original number is 6 digit, but result is 7, which may cause to drop the most significant bit and become 14 instead. The result can be arrived by adding all the numbers together from the right side towards left and carrying over if both of them are 1. Conversion is done from right to left by adding all the numbers starting by 1 multiplying by 2 for every digit count and multiplying by the value itself, so 1*0+1*2*1+ 1*2*2*1+....
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Egidijus S.

Answered by Egidijus, Computing IB tutor with MyTutor

1183 views

How is frequency density calculated?

Frequency divided by class width
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Umamah Y.

Answered by Umamah, Maths GCSE tutor with MyTutor

2626 views

What is a ligand?

A species with one or more valence electron pairs that forms co-ordinate bonds with a metal ion. 
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Umamah Y.

Answered by Umamah, Chemistry A Level tutor with MyTutor

1411 views
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