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Flashcards in yawn Deck (23)
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1
Q

What are the 4 kinds of data?

A

Nominal
Ordinal
Interval
Ratio

2
Q

What is nominal data?

A

Categorical, cannot be ordered

3
Q

What is ordinal data?

A

Order can be defined

4
Q

What is interval data?

A

Order can be defined

Differences between values can be quantified

5
Q

What is ratio data?

A

Order can be defined
Differences between values can be quantified
Ratios between values can be quantified

6
Q

Frequency distribution curves which are not symmetrical are said to be…

A

Skewed

7
Q

For a normal distribution what al have the same values?

A

Mean
Median
Mode

8
Q

What does positively skewed distribution look like?

A

Peak on the left side

9
Q

How do you decide the number of classes to group data into?

A

Square root total number of data values

10
Q

What is the nearest neighbour index?

A

Measures the extent to which a spatial distribution is ‘clustered’

11
Q

What do Rn values mean?

A

Nearest neighbour index values:
0= clustered
2.15= regular

12
Q

What is location quotient?

A

A measure of how concentrated a particular factor is within a certain area, eg a demographic group.

13
Q

How do you interpret location quotient?

A

1=factor is represented in your area the same conc as the wider area, >1= has higher average conc, below =lower

14
Q

I’m spearman’s, what is d?

A

Difference in ranks.

15
Q

What are 3 tests used to decide whether there’s a significant difference between 2 sets of values?

A

Students t test
Mann Whitney U test
Chi squared (observed vs theoretical)

16
Q

What does the students t test do?

A

Compares the means of 2 sets of data to decide if there’s a significant difference between them

17
Q

What’s different about the students t test?

A

It’s a parametric test- should only be used when the data follows a normal distribution.

18
Q

What does the Mann Whitney U test do?

A

Compares the median values to determine whether there’s a significant difference between 2 data sets.
(Like t test but for medians)

19
Q

Why is the Mann Whitney u test flexible?

A

Non parametric- makes no assumption of data being normally distributed.

20
Q

What is the degrees of freedom for spearman’s ?

A

The number of paired values in the data set.

21
Q

What is the significance value?

A

The chance of the result happening randomly

22
Q

What significance level do u use in geography?

A

0.05

23
Q

What do u do w the results lf the Mann Whitney u test?

A

Smaller u value less than critical value: null hypothesis rejected