STATS AND MECH Flashcards

(37 cards)

1
Q

Daily mean temperature

A

Average temp readings for 24 hours

DEGREES

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2
Q

Daily total rainfall

A

in mm
Trace is <0.05
0 when doing mean

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3
Q

Daily total sunshine

A

Nearest tenth of an hour

It’s the amount bright sunshine

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4
Q

Daily maximum relative humidity

A

% of air with water vapour

over 95 is fog

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5
Q

Daily mean wind speed

A

In knots

In Beaufort scale

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6
Q

1 knot in km

A

1.8

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7
Q

Beaufort scale range

A

0 - calm
6 - strong breeze
12 - hurricane

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8
Q

Daily maximum gust

A

Maximum wind speed in a day

In knots

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9
Q

Daily mean wind direction

A

From north a bearing not padded with 0s

Rounded nearest 10

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10
Q

Cloud cover

A

In oktas, fraction of sky covered by cloud

0-8

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11
Q

Visibility

A

DECAMETERS (10cm)

Greatest distance an object can be seen in daylight

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12
Q

Mean pressure

A
Mean pressure at sea level
In hPa (100pa)
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13
Q

Typical pressure range

A

900-1100hPa

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14
Q

Frequency, cw, density equation

A

freq = fd* cw

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15
Q

How to prove statically independent

A

P(A) * P(B) == P(A n B)

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16
Q

Answer to ‘why include this reading/stat’

A

It is a piece of data and we should consider all the data

17
Q

Answer to ‘why exclude this reading/stat’

A

It is an extreme value and could unduly influence the analysis

18
Q

How to answer give an interpretation of the correlation between X and Y

A

as X (in/decreases), Y (in/decreases)

19
Q

How to answer ‘give interpretation of regression line’

A

a X amount increase in X gives rise to a Y increase in Y

20
Q

How to answer comment on suitability of sampling method

A

Anything valid such as ‘could use from more locations/from more months’

21
Q

How to answer suggest how would better use the large data set

A

Use more locations and more of the months

22
Q

How to answer comment on validity of the model to obtain answer

A

RELATE the sampling type to the question, eg is the sample random?

23
Q

How to explain restriction in polynomial function (eg for some range of values of X)

A

Substitute the min and max range
Show some sort of relationship between the answers to the subbed in
Link it, explain ‘eg it must be positive’

24
Q

How to write equation for motion of an object

A

OBJECT (NOT COMBINED) mass * a (a is unknown) = +-T (depending if it’s under g or not, T points always to the pulley) +- X. X could be the mass * g (if it’s under gravity) or if it’s on something then it’s the resistive forces (or just 0 if none)

25
Improvements which can be made to a model
BETTER ACCURACY FOR g Variable resistance Include dimensions of the objects (give an object, eg the ball)
26
What is the critical region
Region to accept alt hyp
27
How to find actual significance level
The values for the critical regions added (for two tail) as a percentage
28
For finding critical region, use equal and greater/less operands or just >. < without the equals
WITH the equals always
29
Asterisk on box plot
Outlier
30
AS level distributions TYPES
uniform discrete | continuous etc
31
AS level distribution MODELS
binomial
32
how to answer ‘why is this not a suitable model.. etc’ o.e.
X may not be proportional to Y | X may be affected by other things like ….
33
Binomial requirements
independent Fixed size sample Two outcomes
34
Sampling frame
Set of people/things which can be included in the sample
35
What is a statistic
Random variable that is a function of the sample with contains NO unknown params
36
Census vs sample
Census includes everyone in a population | Sample is a sample
37
What dates large data set
May to Oct 87,2015