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Data Management MDM4U1 > U2 Two-Variable Statistics > Flashcards

U2 Two-Variable Statistics Flashcards

1
Q

Two-Variable Analysis

A

demonstrates if one variable affects the other

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2
Q

Scatter Plot

A

graph that shows the relationship between 2 variables

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3
Q

Correlation Coefficient

A

( r ) a measure of how well a linear model fits a 2-variable data set

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4
Q

Correlation

A

describes how 2 variables are related

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5
Q

Correlation Classifications

A

TYPE
- Linear
- Non Linear
STRENGTH
- none
- weak
- moderate
- strong
- perfect
DIRECTION
- positive
-negative

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6
Q

regression

A

analytic technique to determine a model that fits a LOBF/COBF

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7
Q

interpolation

A

estimating a value between data points

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8
Q

extrapolation

A

estimating a value beyond data points

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9
Q

linear regression

A

determine LOBF equation

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10
Q

residual value

A

vertical deviation of a data points from the LOBF/COBF

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11
Q

outlier

A
  • points that do not follow the trend
  • affects LOBF drastically
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12
Q

external factors

A

influence trends and misleads predictions made from extrapolation

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13
Q

Coefficient of determination

A

( r^2) a measure of how well a COBF fits a 2-variable set of data

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14
Q

cause & effect

A

change in x makes a change in y

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15
Q

common cause

A

variable causes 2 variables to change

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16
Q

reverse cause & effect

A

dependent and independent variables are reversed in process

17
Q

dependent is the…

A

y variable

18
Q

independent is the…

A

x variable

19
Q

accidental relationship

A

coincidental correlation between 2 varibales

20
Q

presumed relationship

A

no cause & effect relationship or common cause but it does not seem to be accidental

21
Q

extraneous variable

A

variables not being investigated that can affect the outcome

22
Q

control group

A

may help remove/reduce the effect if an extraneous variable

23
Q

bias factos

A
  • poor wording
  • bad data collection
  • misinterpretation
  • poor analysis
24
Q

correlation coefficient strong range

A

(negative or positive) 1 to 0.67

25
Q

correlation coefficient moderate range

A

(negative or positive) 0.67 to 0.33

26
Q

correlation coefficient weak range

A

(negative or positive) 0.33 to 0

27
Q

what is the correlation coefficient for a perfect correlation

A

(negative or positive) 1

28
Q

what is the correlation coefficient for no correlation

A

0

29
Q

hidden variable

A

variable that affects or obscures the relationship between two other variables, but is difficult to detect

Data Management MDM4U1 (7 decks)

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