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Maths > W1 > Flashcards

W1 Flashcards

1
Q

What’s another name for categorical data?

A

Qualitative

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2
Q

What’s another name for numerical data?

A

Quantitative

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3
Q

What is categorical data?

A

When you take things and put them into groups, or categories.

Eg. if you asked people what year level they are, what hair colour they have, or what modes of transport they use, etc.

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4
Q

What are the two types of categorical data?

A

Normal and ordinal.

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5
Q

What is nominal categorical data?

A

Data that doesn’t have a set or particular order, but is just names for different categories.

Eg. If you gathered information about people’s hair colour.

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6
Q

What is ordinal categorical data?

A

Data that has a set order to it.

Eg. The year level or the place someone gets in a race.

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7
Q

What is numerical data?

A

Data that is a numeric value.

Eg. if you were surveying different classes to find out how many students had pets (not the kind of pets that they had).

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8
Q

What are the two types of numerical data?

A

Dicrete and continuous.

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9
Q

What is discrete numerical data?

A

Data that can only be counted, and can only be whole numbers.

Eg. if you wanted to find out how many kittens were in various cages at an animal shelter, you would count that.

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10
Q

How is discrete numerical data represented?

Decimals or not?

A

In whole numbers.

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11
Q

What is continuous numerical data?

A

Data that is measured, and can be any value within a given range, so not necessarily whole numbers.

Eg. If you gathered data on people’s height.

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12
Q

How is continuous numerical data represented?

Decimals or not?

A

Not necessarily whole numbers.

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13
Q

What are the two types of scales in continuous data?

A

Interval scale and ratio scale.

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14
Q

What is interval scale?

A

A scale for continuous numerical data. The numbers have units that are equally spaced apart (like centimetres) and have an order on a scale where the value of zero does stand for a lack of that variable.

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15
Q

What is ratio scale?

A

A scale for continuous numerical data where the numbers have units that are equally spaced apart (like centimetres) and have an order on a scale where the value of zero doesn’t stand for a lack of that variable.

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16
Q

What are frequency tables used for?

A

To organise and display both categorical and numerical data.

17
Q

What is relative frequency?

A

A percentage of how many of the total are in that category or value.

18
Q

What are bar charts used for?

A

To display categorical data.

19
Q

How a bar charts formatted?

Horizontal or vertical?

A

Either horziontal or vertical.

20
Q

What are on the axis of bar charts?

A

Frequency/relative frequency on one axis and the categories on the other.

21
Q

Are there gaps between the bars on bar charts?

A

Yes.

22
Q

What is the mode/modal category?

A

The most common category or value of data.

23
Q

Can there be more than one mode?

A

Yes, if there is a tie between data.

24
Q

What are dotplots used for?

A

Categorical data or discrete numerical data.

25
Q

When are dotplots used?

A

If there aren’t many pieces of data, typicaly below 50.

26
Q

What does a dotplot look like?

A

A number line, evenly spaced, with dots going vertically above the categories.

27
Q

What are histograms used for?

A

Big sets, typically above 50 pieces, of numerical data that can be continuous or discrete.

28
Q

How do you calculate the percentage frequency?

A

Number of data for category / total data x 100.

29
Q

Are there spaces between the bars on histograms?

A

No.

30
Q

What’s on both axis of histograms?

A

The frequency/relative frequency and the category/number.

31
Q

When should you use a stemplot?

A

When displaying numerical data less tha 50 units.

32
Q

Can stemplots represent decimals?

A

Yes, there will be a key.

33
Q

What does a symmetric data display look like?

A

Either high in the middle and low on the ends, or high on the end and low in the middle.

34
Q

What does a positively skewed data display look like?

A

More data at the low end of the numbers.

35
Q

What does a negatively skewed data display look like?

A

More data at the high end of the numbers.

36
Q

What are outliers?

A

Outliers are values outside the main body of the data.

Maths (9 decks)

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