Reviewer - Stats

Question 1

experiment?

Answer 1

activity that can be repeatedly done under similar conditions

Question 2

outcome?

Answer 2

the result of the experiment

Question 3

sample space

Answer 3

possible outcomes in the experiment

Question 4

what is random variable?

Answer 4

numerical amount that results from an experiment

Question 5

what are the 2 types of random variable?

Answer 5

1. discrete
2. continuous

Question 6

discrete?

Answer 6

countable numbers

Question 7

continuous

Answer 7

not countable but measurable
( height, weight )

Question 8

non-negativity property?

Answer 8

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

Question 9

norming property

Answer 9

Σ p(x)=1

Question 10

Probability Mass Function or Discrete Random Distribution

Answer 10

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

Question 11

symbol of observation in sample & population data

Answer 11

n & N

Question 12

symbol of mean in sample & population data

Answer 12

x̄ & µ

Question 13

symbol of variance in sample & population data

Answer 13

s^2 & σ^2

Question 14

symbol of SD in sample & population data

Answer 14

s & σ

Question 15

what is variance?

Answer 15

describe the amount of spread, dispersion in a distribution

Question 16

what is SD?

Answer 16

a measure of how dispered the data is

Question 17

what is mean?

Answer 17

a measure of the central location of a random variable

Question 18

normal distribution?

Answer 18

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

Question 19

properties of norm distribution

Answer 19

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

Question 20

population

Answer 20

entire group

Question 21

sample

Answer 21

specific group

Question 22

symmetric

Answer 22

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

Question 23

skewed right

Answer 23

uneven distrib where the mean is larger than median

Question 24

skewed left

Answer 24

uneven distrib where the median is larger than mean

Question 25

standard normal distribution?

Answer 25

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