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34 Cards in this Set
- Front
- Back
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What is daily total rainfall? |
Including solid precipitation such as snow which is melted before being included in any measurements Anything below 0.05 mm are recorded as 'tr' |
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What are the only data recorded overseas? |
Daily mean temperature, pressure, wind speed and total rainfall |
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What is daily mean cloud cover? |
Measured in oktas or 8ths of the sky covered by cloud |
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What are the units for daily mean pressure? |
Hectopascals (hPa) |
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Label |
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What are the conditions needed for binomial distribution? |
Fixed number of trials and probability Only 2 outcomes (success and failure) The trials are independent of each other |
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What is the formula for binomial distribution? |
X~B(n,p) = nCr(p)^r (q)^n-r |
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What is a probability mass function? |
It is the P(X=x) { (Prob) X= outcomes { (Prob) X= outcomes { 0 Otherwise |
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What is the test statistic? |
The result of the experiment that has been calculated e.g. X= the number of heads tossed in 8 tosses |
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What is a hypothesis test? |
Uses a sample or an experiment to determine whether the or not to reject the hypothesis |
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When it says state the probability of incorrectly rejecting H0, what does that mean? |
What is the actual significance level of the test |
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What do you need to remember when doing a two-tailed test? |
Halve the significance level for each end |
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What do you need to remember in terms of the rules of coding for standard deviation? |
Adding or subtracting numbers in a code or have no effect on standard deviation |
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Why would something be suitable to be represented by a histogram? |
The data is continuous and it is given in a grouped frequency table |
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How do you derive the other suvat equations using v = u + at and s = [(u+v)/2 ]t |
Sub them into each other |
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What does the actual significance level mean? |
The probability of falsely rejected the null hypothesis |
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What do you need to remember when calculating standard deviation of coded data? |
Anything that is added or subtracted in the coding is ignored |
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How do you find out if two events are independent? |
If P(A) X P(B) = P(AnB) |
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When calculating the product moment correlation coefficient, what do you need to remember with data values with n/a or tr? |
Leaving out of the table when calculating the regression value Tr = 0 |
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What do you need to do if in a normal distribution question they ask you what is the probability of a certain number occuring? |
Use binomial distribution |
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What do you need to work out if asked to work out the SD of a grouped frequency table? |
Add extra collumns for fx and fx^2 |
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How to you draw a frequency polygon for a cumulative frequency diagram? |
Draw points at the top of the mid point of each class interval and join the dots up using a straight line |
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How do you derive the suvat equation of v = u +at? |
Find the gradient of the line which is equal to a |
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Why might it not be suitable for a regression line to be used predict an x value given a y value? |
Regression line should only be used to predict a y value for a given x value |
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Why might a sample size of N not be generated in the large data set? |
The may be missing values as data isn't available for certain days |
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What is the area under a normal distribution curve? |
1 |
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For inverse normal function what do you need to do to find X>a? |
Do 1 - given area |
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What is the formula for coding values into a normal distribution and what are the parameters for normal distribution? |
Z = X- mean / S.D Z~N(0,1^2) |
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When finding the corresponding z value for p on the table how do you find P(Z<z)? |
-Answer on the probability table |
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When can normal distribution be used to approximate binomial distribution? |
When N is large and p is close to 0.5 |
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What do you need to remember when approximating a binomial distribution using a normal distribution? |
Do a continuity check where you take upper bounds |
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For discrete, P(X>4) , P(X<4), P(X=4), P(X<=4) and P(X>=4) what are the continuous terms? |
P(X>4.5) P(X<3.5) P(3.5<X<4.5) P(X<4.5) P(X>3.5) |
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How do you find S.D given the variance in hypothesis testing? |
√(sigma^2)/n |
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What do you need to remember if you aren't given the value of z in the table? |
Use inverse normal function |
