Large Data Set
Terms in this set (34)
List the variables covered for the UK locations:
- Daily Mean Temperature
- Daily Total Rainfall
- Daily Total Sunshine
- Daily Mean Windspeed (+Beaufort Conversion, +Direction)
- Daily Maximum Gust (+Direction)
- Daily Maximum Relative Humidity
- Daily Mean Total Cloud
- Daily Mean Visibility
- Daily Mean Pressure
What is Daily Mean Temperature? What are its units?
The average of the hourly temperature readings in a 24-hour period, measured in °C.
Daily Total Rainfall includes...
All precipitation, including snow/hail, which are melted before measurements are taken.
What does 'tr' mean? How should it be treated in calculations?
Trace- precipitation (daily mean rainfall) is less than 0.05mm. It should be included in samples, but given as 0.
Daily Mean Rainfall is measured in...
Daily Total Sunshine is measured...
In hours, to the nearest 0.1 of an hour
What is meant by 'cardinal' direction?
N, E, S, W (i.e. compass directions)
Where (relative to the weather station) is wind speed measured?
10 metres above the ground
Convert the Beaufort scale to knots.
0 (Calm): <1 knot
1-3 (Light): 1-10 knots
4 (Moderate): 11-16 knots
5 (Fresh): 17-21 knots
1 knot = ___ mph
What direction are angles of direction given from?
North (i.e. they are given as bearings).
Wind Speeds (average and gusts) are measured in:
Daily Maximum Relative Humidity is measured in...
What does n/a mean? How should it be treated in calculations?
The data is not available. The data point should not be included in samples/calculations.
What is Daily Maximum Gust?
The highest instantaneous wind speed in a day.
What is Daily Maximum Relative Humidity?
The amount by which air is saturated with water vapour.
What does a relative humidity above 95 mean?
The conditions are misty/foggy.
What is Daily Mean Total Cloud? What is it measured in?
How many eighths of the sky are obscured by cloud, measured in Oktas.
What is Daily Mean Visibility? What is it measured in?
The greatest horizontal distance from which an object can be seen in daylight. It is measured in Decametres (Dm), where 1 Dm = 10 metres.
What is Daily Mean Pressure measured in?
Hectopascals (hPa), where 1 hPa = 100 Pa.
Name each of the UK locations, and give their altitudes in order.
Name each of the International locations, and give their altitudes.
Beijing, China: 55m
Jacksonville, Florida: 9m
Perth, Australia: 29m
What is an issue with using random sampling for the data set to get a sample of size n?
Some of the data values are not available.
Describe the general location of Perth:
Coastal city in Western Australia, located in the Southern Hemisphere.
What should be considered when comparing data from two locations to support a hypothesis?
The sample size can be very low (e.g. one data point) so is not enough to be reliable.
Describe the general location of Beijing:
A (mega)city located in North China, in the Northern Hemisphere. (Not coastal, but close to mountain ranges)
Describe the general location of Jacksonville:
A coastal city in north-eastern Florida, located in the Northern Hemisphere.
List the UK locations, South to North:
Cambourne, Hurn, Heathrow, Leeming, Leuchars
Which of the locations in the data set is/are inland?
Leeming, Heathrow, Beijing
Which of the locations in the data set is/are coastal?
Leuchars, Hurn, Camborne, Jacksonville, Perth
Which location is furthest North?
Which location is closest to the Equator?
Order the International locations and the whole UK North to South:
- UK, Beijing, Jacksonville, Perth -
What are the time periods included in the data set?
May-October 1987, May-October 2015