Statistik - formler. Flashcards

1
Q

Typvärde

A

Det vanligaste värdet.

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2
Q

Median.

A

Det värde som delar upp fördelningen i två lika stora halvor (det vill säga 50:e percentilen).

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3
Q

Aritmetiskt medelvärde.

A

x med ett streck över = Summan av alla x / n.

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4
Q

Variationsbredd.

A

Xmax - Xmin

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5
Q

Kvartilsavvikelse.

A

Q=q3 - q1 /2

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6
Q

Varians.

A

s^2 = Summan(x - x bar)^2 /n-1

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7
Q

Standardavvikelse.

A

s = Kvadratroten ur Summan(x - x bar)^2 / n-1

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8
Q

Variationskoefficienten.

A

v = s / x bar.

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9
Q

Standardpoäng (z)

A

z = x - x bar / sx

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10
Q

Pearsons produktmomentrelationskoefficient.

A

r = Summan Zx Zy / n-1

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11
Q

Medelvärdet i en samplingsfördelning av medelvärden.

A

µx bar = µx

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12
Q

Standdardavvikelsen i en samplinsfördelning av medelvärden.

A

Går inte att skriva ut eller beskriva. Kolla i bokfan.

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13
Q

Hypotesprövning av enskilt stickprovsmedelvärde, känd populationsavvikelse, så kallat z-test.

A

Går inte heller att skriva ut.

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14
Q

Cohens d. effektstyrkemått för t-test.

A

Går inte heller att skriva ut för den jävlas krumeluren.

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15
Q

Regressionsbaslinjen.

A

^y = b0 + b1x

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16
Q

Regressionskoefficienten.

A

b1 = r (sy / sx)

17
Q

Interceptet.

A

b0 = y bar - b1x bar