Formule Flashcards

1
Q

frecvența relativă

A

fr=f/N

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

percentila

A

percentilă=nr. de scoruri mai mici sau egale cu scorul dat/nr de scoruri posibile totul *100

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

media

A

m=suma scorurilor/N

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

locul medianei

A

locmed=N+1/2

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

scorul pentru percentila dată

A

scor=proporție*N

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

media ponderată

A

m=m1N1+m2N2/N1+n2

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

amplitudinea

A

A=scormax-scormin

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Abaterea intervarctilică

A

AIQ=Q3-Q1

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Abaterea standard (aproximată)

A

abatere=1/6*A

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Coeficientul de variabilitate Pearson

A

V=abatere/medie*100

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Cota z

A

z=x-medie/abatere

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Testul Z

A

|z|=m1-m2/Radical din (varianță1/N1+varianță2/N2)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Testul t + n(grade de libertate)

A

|t|=m1-m2/Radical din varianță*(1/N1+1/N2)

n=N1+N2-1

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Testul X^2 + n

A
  1. X^2=Suma de (Fo-Ft)^2/Ft, Ft=N1+N2+….+Nn/n
    n=K-1, k=nr. de grupe/categorii
  2. X^2=(ad-bc)^2T/(a+b)(c+d)(a+c)(b+d), T=total general
    n=(rânduri-1)
    (coloane-1)
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Eroarea standard a mediei

A

E=abatere eșantion/radical din N eșantion

How well did you know this?
1
Not at all
2
3
4
5
Perfectly