Part 5, diving into data

Question 1

what is the median

Answer 1

this is a measure of location or a measure of central tendency. this tells us exactly where the centre of the dataset is

Question 2

what is the interquartile range

Answer 2

this is a measure of spread or dispersion. It tells us how far the data travels from the median.

Its found by splitting the data set into 4 quarters and then taking the middle 50%

Question 3

what would the value r be for each of these

1. strong positive correlation
2. weak negative correlation
3. no correlation

Answer 3

what do the correlation coefficients of each of these mean

1. r = 1
2. r = -0.3
3. r =0

Question 4

at this stage we would

writing and testing code by implementing the algorithm

Answer 4

in the context of programming what would we do at stage 3 carry out the plan of george polyas problem solving process

Question 5

This is a built in library in python that can read csv files and translate them into lists

Answer 5

what is the python csv libary for

Question 6

what are the steps of the high level algorithm for finding the median

Answer 6

1. sort numbers
2. find length of list
3. if length is odd

 3a. set median to middle number

4. otherwise

 4a. find two middle numbers

 4b. set median to mean of two middle numbers

Question 7

this was a hungarian who studied the process of problem solving

Answer 7

who was george polya

Question 8

This function opens a file, and returns it as a file object

Answer 8

what is the python open() function for

Question 9

what are the 4 steps of an algorithm to find the interquartile range

Answer 9

1. Find the median
2. Split the data into a lower half and an upper half
3. Find the median of each half
4. Subtract the lower median from the upper one.

Question 10

who was george polya

Answer 10

this was a hungarian who studied the process of problem solving

Question 11

what is the python open() function for

Answer 11

This function opens a file, and returns it as a file object

Question 12

1. Find the median
2. Split the data into a lower half and an upper half
3. Find the median of each half
4. Subtract the lower median from the upper one.

Answer 12

what are the 4 steps of an algorithm to find the interquartile range

Question 13

what are heuristics

Answer 13

these are methods of discovery or invention. Rules of thumb that help us to solve problems.

Question 14

what do the correlation coefficients of each of these mean

1. r = 1
2. r = -0.3
3. r =0

Answer 14

what would the value r be for each of these

1. strong positive correlation
2. weak negative correlation
3. no correlation

Question 15

1. sort numbers
2. find length of list
3. if length is odd

 3a. set median to middle number

4. otherwise

 4a. find two middle numbers

 4b. set median to mean of two middle numbers

Answer 15

what are the steps of the high level algorithm for finding the median

Question 16

in the context of programming what would we do at stage 2 make a plan of george polyas problem solving process

Answer 16

at this stage we would

Create an algorithm and apply heuristics to help solve any complex problems

Question 17

at this stage we would

Create an algorithm and apply heuristics to help solve any complex problems

Answer 17

in the context of programming what would we do at stage 2 make a plan of george polyas problem solving process

Question 18

1. Understand the problem
2. Make a plan
3. Carry out the plan
4. Look back

Answer 18

what are the four steps of problem solving that hungarian george polya laid out

Question 19

this is a measure of location or a measure of central tendency. this tells us exactly where the centre of the dataset is

Answer 19

what is the median

Question 20

this is a measure of spread or dispersion. It tells us how far the data travels from the median.

Its found by splitting the data set into 4 quarters and then taking the middle 50%

Answer 20

what is the interquartile range

Question 21

1. Break the problem into smaller sub-problems.
2. Try to solve a simpler form of the problem.
3. Think if there is a pattern you have seen before.
4. Try working backwards from the solution.
5. Try representing the problem in a different way.
6. Don’t give up too quickly.
7. Don’t be afraid to make mistakes.

Answer 21

name 7 heuristics

Question 22

what is the syntax for the python open() function

Answer 22

the syntax for this is

name(file, mode)

file = the path and name of the file

mode = a string defining what mode you want to open the file in.

Question 23

in the context of programming what would we do at stage 3 carry out the plan of george polyas problem solving process

Answer 23

at this stage we would

writing and testing code by implementing the algorithm

Question 24

what is the algorithm for including or excluding rows from a table given a condition

Answer 24

1. initialise an empty table table1
2. for each row in table0

 2a. if row satisfies condition

 2b. append row to table1

Question 25

these are methods of discovery or invention. Rules of thumb that help us to solve problems.

Answer 25

what are **heuristics**

Question 26

name 7 **heuristics**

Answer 26

1. Break the problem into smaller sub-problems. 2. Try to solve a simpler form of the problem. 3. Think if there is a pattern you have seen before. 4. Try working backwards from the solution. 5. Try representing the problem in a different way. 6. Don’t give up too quickly. 7. Don’t be afraid to make mistakes.

Question 27

in the context of programming what would we do at **stage 1 undertsnad the problem** of george polyas problem solving process

Answer 27

at this stage we would **Write tests first to better understand the problem at hand**

Question 28

what are the **four steps of problem solving** that hungarian george polya laid out

Answer 28

1. Understand the problem 2. Make a plan 3. Carry out the plan 4. Look back

Question 29

Answer 29

what is the formula to find the **interquartile range**

Question 30

the syntax for this is *name*(file, mode) file = the path and name of the file mode = a string defining what mode you want to open the file in.

Answer 30

what is the syntax for the python **open() function**

Question 31

at this stage we would **Write tests first to better understand the problem at hand**

Answer 31

in the context of programming what would we do at **stage 1 undertsnad the problem** of george polyas problem solving process

Question 32

what is the **python csv libary** for

Answer 32

This is a built in library in python that can read csv files and translate them into lists

Question 33

1. initialise an empty table table1 2. for each row in table0  2a. if row satisfies condition  2b. append row to table1

Answer 33

what is the algorithm for including or excluding rows from a table given a condition

Question 34

this is a number between -1 and +1 and is usually denoted by r. it tells us how closely the points of two data sets follow the trend line

Answer 34

what is the **correlation coefficient**

Question 35

what is the formula to find the **interquartile range**

Answer 35

Question 36

at this stage we would Look at any challenges overcome, any resources used, what was learnt that can be applied in the future

Answer 36

in the context of programming what would we do at **stage 4 look back** of george polyas problem solving process

Question 37

what is the **correlation coefficient**

Answer 37

this is a number between -1 and +1 and is usually denoted by r. it tells us how closely the points of two data sets follow the trend line

Question 38

in the context of programming what would we do at **stage 4 look back** of george polyas problem solving process

Answer 38

at this stage we would Look at any challenges overcome, any resources used, what was learnt that can be applied in the future