Edexcel large data set

Question 1

large data set facts
-daily mean temp in celsius - avg of hourly temp doing 24-hr period
- daily total rainfall - amounts less than 0.05mm are recorded as tr/trace
- daily total sunshine recorded to the nearest tenth of a hour
- daily mean wind direction and windspeed in knots - knots is nautical miles per hr.
direction as bearings, windspeed to beaufort scale
- daily max gust (in knots) - highest instantaneous windspeed recorded + its direction
-daily maximum relative humidity - given as a percent of air saturation with water vapour. relative humidities above 95% give rise to misty and foggy conditions
- daily mean cloud cover - measured in oktas ( in eights of sky covered by cloud, highest value it can be is 9)
- daily mean visibility - measured in decametres (Dm). greatest horizontal distance an object can be seen at in daylight
- daily mean pressure - measured in hectopascals (hPa)
- for overseas locations, the only data recorded are daily mean temp, daily total rainfall, daily mean pressure, daily mean windspeed

Answer 1

• if need to do a numerical calculation involving a trace amount, can treat it as 0
• 1kn (knot) =1.15 mph
• missing data is represented as n/a or not available
• give the answer to the same degree of accuracy as the data values, and units.

Question 2

beaufort scale

Answer 2

beaufort scale - descriptive term - avg speed at 10m above ground
0 - calm - less than 1 knot
1-3 - light - 1 to 10 knots
4 - moderate 11 to 16 knots
5 - fresh 17 to 21 knots