Retake

Question 1

Steps to solve it

Answer 1

Question 2

Cohen’s d formula

Answer 2

Question 3

If the confidence interval does not include the value of zero effect, it can be assumed that there is

Answer 3

a statistically significant result.

Question 4

IF YOU CHANGE ONE VALUE IN A SAMPLE, MEAN

Answer 4

CHANGES

Question 5

IF YOU ADD / REMOVE AN OBSERVATION TO / FROM A SAMPLE, MEAN

Answer 5

CHANGES, UNLESS THAT OBSERVATION HAS THE VALUE OF THE MEAN.

Question 6

IF YOU MULTIPLY/DIVIDE ALL VALUES IN A SAMPLE BY A CONSTANT,

Answer 6

THE MEAN WILL ALSO BE MULTIPLIED/DIVIDED BY THAT CONSTANT.

Question 7

IF YOU ADD / SUBTRACT A CONSTANT TO ALL VALUES IN A SAMPLE,

Answer 7

YOU ADD / SUBTRACT THAT SAME CONSTANT FROM THE MEAN.

Question 8

THE MEDIAN (MD):

Answer 8

IS A VALUE FROM A SAMPLE OR A POPULATION DIVIDING ALL OBSERVATIONS INTO TWO EQUAL HALVES. MEDIAN CAN BE AN AVERAGE OF TWO VALUES WHEN A SAMPLE OR A POPULATINO HAS AN EVEN NUMBER OF OBSERVATIONS.

Question 9

How to solve it?

Answer 9

Question 10

y REPRESENTS

Answer 10

VALUES OF A DEPENDENT VARIABLE

Question 11

x REPRESENTS

Answer 11

VALUES OF AN INDEPENDENT VARIABLE

Question 12

ŷ REPRESENTS

Answer 12

PREDICTED VALUES OF D.V.

Question 13

e IS A

Answer 13

RESIDUAL TERM

Question 14

REGRESSION LINE IS A SET OF ALL

Answer 14

ŷ

Question 15

a IS AN INTERCEPT TERM:

Answer 15

A VALUE OF y, WHEN x = 0

Question 16

a=

Answer 16

Question 17

B COEFFICIENT IS

Answer 17

THE EFFECT OF X ON Y

Question 18

COEFFICIENTS DO NOT REPRESENT RELTIVE STRENGTH OF EFFECTS, BECAUSE

Answer 18

SIZE OF B DEPENDS NOT ONLY ON THE STRENGTH OF EFFECT, BUT ALSO ON MEASUREMENT UNITS.

Question 19

TO OBTAIN RELATIVE COMPARISSON OF EFFECT SIZE WE NEED TO Z STANDARDIZE ALL OF OUR VARIABLES.

Answer 19

Question 20

r kvadratu formulė

Answer 20

Question 21

ASSUMPTIONS OF REGRESSION ANALYSIS

Answer 21

1. Linearity: the relationship between X and the mean of Y is linear.
2. Independence: observations are independent of each other.
3. Homoscedasticity: variance of residuals is the same for all values of X.
4. Normality of residuals: for any fixed value of X, Y is normally distributed

Question 22

What are the effect sizes of Cohen’s D?

Answer 22

Question 23

How to solve it?

Answer 23

Question 24

SSt=

Answer 24

Question 25

SSw=

Answer 25

SS1+SS2+SS3

Question 26

SSb=

Answer 26

SSt-SSw

Question 27

DFt=

Answer 27

N-1

Question 28

DFb=

Answer 28

k-1

Question 29

DFw=

Answer 29

N-k

Question 30

Answer 30

Question 31

Answer 31

Question 32

Answer 32

Question 33

Answer 33

Question 34

Answer 34

Question 35

Bimodal

Answer 35

Question 36

Positively skewed

Answer 36

Question 37

Symetric-unimodal

Answer 37

Question 38

If we increase s,

Answer 38

value of t will be lower

Question 39

If we increase n,

Answer 39

value of t will increase too

Question 40

Jei didėja p,

Answer 40

didėja galimybė atmesti H0

Question 41

How to solve it?

Answer 41

Question 42

Solve it

Answer 42

Question 43

A larger n would lead to

Answer 43

a larger df and smaller tc. Also, lead to smaller s and smaller sM, producing a larger tT. This would also make rejecting H0 more likely

Question 44

Smaller SS would lead to

Answer 44

smaller s and smaller sM, producing larger tT. This would also make rejecting H0 more likely

Question 45

A larger difference between M and miu - the effect size - would also

Answer 45

increase tT, making rejection more likely

Question 46

Spearman rho gali būti tarp

Answer 46

-1 ir 1

Question 47

Ni lygu

Answer 47

SSb/SSt

Question 48

Standard deviation formula

Answer 48

Question 49

Solve it

Answer 49

Question 50

Solve it

Answer 50

Question 51

Answer 51

Question 52

If You will look at this table carefully, You will see a miracle called "pitakas"

Answer 52

Question 53

WITH SKEWED FREQUENCY DISTRIBUTIONS.

Answer 53

A MEAN SHIFTS QUITE STRONGLY IN THE DIRECTION OF OUTLIERS. A MEDIAN, IN THE MEANTIME, STAYS CLOSER TO TYPICAL VALUES. (SEE CHART OF A SKEWED DISTRIBUTION ABOVE).

Question 54

ADDING / SUBTRACTING A CONSTANT TO EACH VALUE

Answer 54

DOES NOT AFFECT STD.

Question 55

MULTIPLYING / DIVIDING EACH VALUE BY A CONSTANT, STD

Answer 55

ALSO GETS MULTIPLIED / DIVIDED BY THAT CONSTANT.