stats

• statistics


  branch of math that deals with caipo of data
• probability


  has been introduced in math to predict how likely events are to happen
• random variable


  a function whose value is a whole number
• discrete random variable


  can be counted
• continuous random variable


  can be measured
• mean


  average of numbers
• variance


  measures how far numbers spread out
• population


  scope of the study
• sample


  part of the population
• sampling method


  process of getting the sample
• respondents


  also called "sample"
• parameter


  describes the population
• statistics


  describes the sample
• probability


  unbiased, random
• non-probability


  biased
• central limit theorem


  population with mean and standard deviation has large sample from the population
• t-distribution


  a probability used to estimate population when the sample size is small
• degree of freedom


  number of independent observance in a set
• simple random sampling


  known as the lottery technique
• stratified sampling


  population is divided into groups or strata
• cluster


  assigned to one, and only one group
• multi-staged sampling


  combination of sampling method
• systematic random sampling 


  selection every KTH
• purposive


  has specific target, biased
• quota


  to fill a number of respondents
• convenience


  who is free\available
• negative z-score


  higher than mean average
• positive z-score


  below mean average
• z-score table


  determine the area under normal curve
• t-test


  if n is less than 30
• z-test


  if n is more than 30
• 32


  if we toss 5 coins, what are the possible outcomes?