large dataset

Question 1

weather stations in the UK

Answer 1

from south to north, they go in alphabetical order(apart from hurn and heathrow)

• Camborne
• Hurn
• Heathrow
• Leeming
• Leuchars

Question 2

camborne and leuchars

Answer 2

• both on the coast, so its windier

Question 3

common sense box

Answer 3

if temperature increases,
- amount of sunshine increases
- amount of rainfall decreases
- windspeed decreases

as we move further north, during may to october,
- the temperature decreases
- amount of rainfall increases
- the maximum hours of sunshine increases

Question 4

UK measurements - not wind

Answer 4

1. daily mean temperature, units:celsius, typical range: 5 - 24 degrees
2. daily total rainfall, measured in : millimeters, typical range: 0 - 20mm. (rainfall is not symmetrical as there are many trace values, eg where it didnt rain)
3. daily hrs of sunshine measured in hrs
4. cloud cover measured in oktas, measured in integers(0-8), measures what fraction of the sky is covered
5. humidity - measured in percentages, how much water vapour is in the air
6. daily mean visibility(how far u can see), measured in Dm, rounded to the nearest hundred
   - 1 dm = 10m
7. daily mean pressure (how much the atmosphere is pushing down, measured in hPA(hectopascals), measured using integers

Question 5

how to clean rainfall data

Answer 5

replacing “tr” with 0mm or 0.025mm

Question 6

uk measurements - wind

Answer 6

1. daily mean windspeed , measured in knots(kn), integers only
   - windspeed can also be measured qualitatively, light, moderate, fresh, strong, most days are light
2. daily maximum gust
   - measured in knots
   - integers only
3. wind gust/direction
   - which direction the wind is blowing from
   - in bearing form
   - multiple of 10 only
4. wind/gust direction(cardinal)
   - uses compass direction(N,SW,ENE)

Question 7

International stations and info abt them

Answer 7

1. Jacksonville, Florida
   - hot summers
   - hurricanes in October
   - windspeed still relatively low in our data
2. Bejing, China
   - Hotter, wetter summers
   - Colder winters
3. Perth Australia
   - Flipped seasons

Question 8

international measurements

Answer 8

• daily mean temperature
• daily mean rainfall, Bejing is rainy in summer
• daily mean pressure
• daily mean windspeed - rounded to 1dp
  Windspeed, Beaufort conversion - light,moderate

Question 9

Which months does the large data set cover

Answer 9

May to October

Question 10

why might random sampling not be reliable for the large data set

Answer 10

some days have no recorded data, so may not reach the required number

Question 11

to increase reliability when measuring daily rainfall

Answer 11

replace any tr values with a value between 0-0.05, eg 0.025