U2T8 - Statistics Flashcards

Statistics

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1
Q

Why must experimental results be analysed?

A

Ensures results can be treated objectively + avoids bias when drawing conclusions.

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2
Q

What is the equation for standard error?

A

Standard Error = the square root of (population variance divided by the number of samples)

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3
Q

What is the equation for the estimation of population variance?

A

Population Variance = (the sum of sample value - sample mean) divided by (num of sample - 1)

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4
Q

What is the equation for 95% confidence limits?

A

95% Confidence Limits = sample mean plus or minus t times the standard error.

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5
Q

What is the equation for the student’s t test?

A

t = (sample mean 1 - sample mean 2) divided by the square root of (standard error of sample 1 squared + standard error of sample 2 squared)

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6
Q

How do you work out the degrees of freedom for the t test?

A

((n1+n2)-2)

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