Statistics

Question 1

Anecdotal evidence

Answer 1

data that is unpublished and personal

• small number of observations
• selection bias
• confirmation bias
• inaccuracy

Question 2

descriptive statistics

Answer 2

generate statistics to summarize data concisely

Question 3

probability mass function

Answer 3

is a function that gives the probability that a discrete random variable is exactly equal to some value. It shows the distributions of a discrete random variable

Question 4

cumulative distribution function

Answer 4

Gives the proportion of population with value less than x

Question 5

percentile rank

Answer 5

The percentile rank of a particular score is defined as the percentage of the scores in a distribution which are at or below the particular score.
The percentile rank of 3.75 is 60%

Question 6

percentile

Answer 6

When a score is identified by its percentile rank, the score is called a percentile.
The 60th percentile is 3.75

Question 7

empirical distributions

Answer 7

distributions that are made of empirical observations and are therefore finite

Question 8

analytical distrubutions

Answer 8

distributions of mathematical functions

Question 9

Distributions types

Answer 9

exponential distributions, normal distributions, lognormal distributions

Question 10

Lognormal distributions

Answer 10

if the logarithms of a set of values is normal

Question 11

cohen’s d

Answer 11

indicates the standardized difference between two means

Question 12

maximum likelihood estimation

Answer 12

is to provide the parameters of a statistical distribution which would most likely produce data similar to what is given.
ex: the parameters for a probability density function is variance and mean