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Midterm Flashcards > Reviewer - Stats > Flashcards

Reviewer - Stats Flashcards

1
Q

experiment?

A

activity that can be repeatedly done under similar conditions

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2
Q

outcome?

A

the result of the experiment

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3
Q

sample space

A

possible outcomes in the experiment

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4
Q

what is random variable?

A

numerical amount that results from an experiment

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5
Q

what are the 2 types of random variable?

A
  1. discrete
  2. continuous
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6
Q

discrete?

A

countable numbers

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7
Q

continuous

A

not countable but measurable
( height, weight )

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8
Q

non-negativity property?

A

between 0 to 1 or 0<p(x)<1

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9
Q

norming property

A

Σ p(x)=1

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10
Q

Probability Mass Function or Discrete Random Distribution

A

it consist of values of a random variable can assume and the corresponding probability

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11
Q

symbol of observation in sample & population data

A

n & N

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12
Q

symbol of mean in sample & population data

A

x̄ & µ

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13
Q

symbol of variance in sample & population data

A

s^2 & σ^2

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14
Q

symbol of SD in sample & population data

A

s & σ

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15
Q

what is variance?

A

describe the amount of spread, dispersion in a distribution

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16
Q

what is SD?

A

a measure of how dispered the data is

17
Q

what is mean?

A

a measure of the central location of a random variable

18
Q

normal distribution?

A

is a probability function that describes how the values of a variable are distributed.

19
Q

properties of norm distribution

A
  1. a bell shape
  2. curve symmetrical at center
  3. mean, median mode coincide at the center
  4. always approaching the axis, but never touching it ( asymptotic )
  5. under curve is 1
20
Q

population

A

entire group

21
Q

sample

A

specific group

22
Q

symmetric

A

a balance distribution of left and right where mean is approx equal to median

23
Q

skewed right

A

uneven distrib where the mean is larger than median

24
Q

skewed left

A

uneven distrib where the median is larger than mean

25
Q

standard normal distribution?

A

a norm dis with mean of 0 and stan deviation with mean of 1

Midterm Flashcards (5 decks)

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