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BREES Year 2 Statistics > Data and Variables > Flashcards

Data and Variables Flashcards

1
Q

Why is data collected?

A

To monitor variables

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2
Q

What is a variable?

A

A descriptor that can take different values

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3
Q

What are the 2 categorical variables?

A

Nominal and ordinal

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4
Q

What do you call named variables?

A

Nominal

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5
Q

What do you call ranked variables?

A

Ordinal

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6
Q

What are the 2 quantitative variables?

A

Ratio and interval

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7
Q

What are the characteristics of ratio variables?

A

Fixed distance between units AND fixed zero

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8
Q

What are the characteristics of interval variables?

A

Fixed distance between units BUT zero is not really zero

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9
Q

What are 2 examples of ratio data?

A

Height and number of beans

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10
Q

What are 2 examples of interval data?

A

Temperature and IQ score

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11
Q

What 2 formats can quantitative data alone be in?

A

Discrete or continuous

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12
Q

What do parameters describe?

A

Population variables

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13
Q

What is another word for central tendency?

A

Average

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14
Q

What are the 3 measures for central tendency?

A

Mean, median and mode

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15
Q

What are the 4 measures of variability?

A

Range, interquartile range, variance and standard deviation

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16
Q

What is range?

A

The spread of all the data

17
Q

What is the interquartile range?

A

It contains the middle
50% of values, so from the 25th - 75th percentile

18
Q

How do you calculate the 25th percentile?

A

0.25 x (N+1) = an xth value

19
Q

How do you calculate the 75th percentile?

A

0.75 x (N+1) = an xth value

20
Q

How do you calculate the IQR?

A

IQR = 75th percentile value ⁠— 25th percentile value

21
Q

What is the relationship between variance and standard deviation?

A

Variance is standard deviation squared

22
Q

What is variance?

A

A measure of how close a variable is to the mean

BREES Year 2 Statistics (4 decks)

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