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A level Statistics > simple defintiions > Flashcards

simple defintiions Flashcards

1
Q

what is a continuous variable

A

a measured variable that can take any value

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2
Q

what is a discrete variable

A

a measured variable that can only take specific values

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3
Q

Define population

A

A complete set of data where every element is included

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4
Q

How is daily mean temperture measured?

A

Values are noted in degrees (celcius) and tenths, values below 0 are preceded by a minus sign

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5
Q

What is the daily mean temperature?

A

The average of the hourly air temperature readings during the period 0900-0900 GMT

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6
Q

How is daily total rainfall measured?

A

millimetres (mm)

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7
Q

What is daily total rainfall?

A

24 hour periods commencing at 0900 GMT on the day of entry and includes any solid precipitation, such as snow or hail, which is melted and measured in the same way as rainfall

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8
Q

How is daily total sunshine measured?

A

In hours and tenths

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9
Q

What is daily total sunshine?

A

The amount of bright sunshine recorded on the day of entry, measured by an instrument that measures the amount of solar radiation exceding a threshold

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10
Q

How is daily maximum relative humidity measuered?

A

As a percentage

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11
Q

What is daily maximum relative humidity?

A

A measure of how close the air is to being saturated with water vapour. Values greater than 95% are associtated with mist and fog

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12
Q

How is wind speed measured?

A

Knots

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13
Q

What is knots to mph?

A

1 knot = 1.15 mph

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14
Q

How is the daily mean wind speed measured?

A

Averaged over the 24 hours from 0000GMT on the date given

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15
Q

What is maximum gust speed?

A

The maximum instantaneous speed that occured during the 24 hours from 0000GMT on the date given

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16
Q

How is the daily mean wind direction measured?

A

Averaged over the 24 hours from 0000GMT on the date given, averaged to the nearest 10 degrees

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17
Q

How is daily maximum gust direction measured?

A

in degrees from true north

18
Q

What is daily maximum gust direction?

A

The direction from which the wind was blowing when the maximum gust during the hour commencing at the time of entry occured

19
Q

What is cloud cover?

A

The fraction of the celestial dome coverd by cloud

20
Q

How is cloud cover measured?

A

Measured in eigths (Oktas)

21
Q

What is visibility?

A

The greatest distance at which an object can be seen and recognized in daylight, or at night could be seen and recognized if the general illumination was raised to daylight level.

22
Q

How is visibility measured?

A

Measured horizontally, values noted in decametres (Dm), a dash indicates data not available

23
Q

How is pressure measured?

A

By the SI unit of pressure, the pascal (Pa)

24
Q

Which station is the furthest north?

A

Leuchars

25
Q

Which station is the furthest south?

A

Perth

26
Q

Describe where Leuchars is

A

A coastal station far north in Scotland

27
Q

Describe where Leeming is

A

An inland station in Northern England

28
Q

Describe where Heathrow is

A

An inland station in Southern England

29
Q

Describe where Hurn is

A

A coastal station in Southern England

30
Q

Describe where Jacksonville is

A

An overseas Coastal station in South East USA

31
Q

Describe where Perth is

A

An overseas coastal station in South West Australia

32
Q

Which station is the furthest north?

A

Leuchars

33
Q

Which station is the furthest south?

A

Perth

34
Q

Describe where Leuchars is

A

A coastal station far north in Scotland

35
Q

Describe where Leeming is

A

An inland station in Northern England

36
Q

Describe where Heathrow is

A

An inland station in Southern England

37
Q

Describe where Hurn is

A

A coastal station in Southern England

38
Q

Describe where Camborne is

A

A Coastal station in South West England

39
Q

Describe where Jacksonville is

A

An overseas Coastal station in South East USA

40
Q

Describe where Perth is

A

An overseas coastal station in South West Australia

41
Q

Describe where Beijing is

A

An overseas inland station in Eastern China

A level Statistics (3 decks)

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