Unit 3.2e Flashcards

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1
Q

What can give rise to qualitative, quantitative or ranked data?

A

Discrete or continuous variables

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2
Q

What is qualitative data?

A

Data that is descriptive and difficult to measure directly

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3
Q

How is qualitative data measured?

A

Using direct counts or by observation

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4
Q

What is quantitive data?

A

Data measured directly

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5
Q

How is quantitative data recorded?

A

It’s recorded as numbers

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6
Q

In comparison to quantitive data, how easy is it to analyse qualitative data?

A

It’s much more difficult to analyse

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7
Q

What is ranked data?

A

It’s data that is put into order of magnitude

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8
Q

What is the mean?

A

It’s the average value for the data set

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9
Q

What is the median?

A

It’s the middle value for the data set when data is ordered from lowest to highest

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10
Q

What is the mode?

A

It’s the most common value in the data set

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11
Q

Why are box plots used?

A

Box plots allow us to see variation within and between data sets

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12
Q

What is the lower quartile?

A

Median of the lower half of data

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13
Q

What is the upper quartile?

A

Median of upper half of data

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14
Q

What do error bars represent?

A

Variation of corresponding coordinates on a point

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15
Q

What can show standard deviation in a data set?

A

Error bars

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16
Q

What do error bars show about the data?

A
  • how spread out the data is around the mean value
  • reliability of the mean value
  • likelihood of significant differences between data sets
17
Q

When should you be wary of a data set?

A

When the error bar is really large

18
Q

What is correlation?

A

The relationship between two variables where they both follow the same pattern

19
Q

What is causation?

A

Something that exists if the changes in value of the independent variable are known to cause changes to the value of the dependent variable

20
Q

What does correlation not equal?

A

Causation