Module 3

Question 1

what is probability

Answer 1

likelihood of an event, A, to occur at random

Range from 0-1.00

Question 2

probability in inferential statisctics

Answer 2

the likelihood that you’d obtain your given data if the null hypothesis were true

Question 3

equation for probability

Answer 3

Question 4

basic probability example

Answer 4

Question 5

probability of independent events

Answer 5

Question 6

equation for probability of independent events

Answer 6

Question 7

example of probability of independent events

Answer 7

Question 8

probability of dependent events

Answer 8

Question 9

percentile rank

Answer 9

ordinal measure to tell us where an observation ranks among other observations

percentage of scores that are at or below a specific value

Only tells us about the rank order of where an observation falls.
Thus, it is an ORDINAL measure. This doesn’t tell us anything about magnitude.

Question 10

percentile rank example

Answer 10

Question 11

percentile rank example #2

Answer 11

Question 12

properties of a normal distribution

Answer 12

the mean, median, and mode are all the same number in a normal distribution

> 2 standard deviations is a accepted sign of rarity

Question 13

standard deviation

Answer 13

The average deviation of an observation in a variable from its mean. Get this by taking the square root of the variance.

(∑(𝑿 − 𝑿̅)^𝟐)/((𝑵−𝟏)) Standard deviation is same equation, but take the square root of the answer

Question 14

variance

Answer 14

The squared deviation of an observation in a variable from its mean