# Statistics

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**37**Ακόλουθοι

The Type of Items of a Questionnaire can be divided in Two main categories together with their Pros and Cons: i) Open-Ended Questions that can give an infinite space for the development of one’s opinion on a subject and —Therefore it can require more time to be analyzed versus Closed-Ended questions and by ii) Closed-Ended Questions which can force you to choose through a number of possible options/choices. —Therefore, participants that would like to choose something else than the given…

Type of Collection – Questionnaire – Question types_open_ended_closed_ended

Variables: #Dependent variables vs #Independent variables. Note that the scale that a variable has been measured does not influence if this variable can be treated as Dependent variable or as Independent Variable but it influences the statistical way that can be analyzed. #Extraneous Variables are those variables that a researcher failed to control or to include into his/her research design but it can influence the final output / outcome.

i) Discrete (Non-Continuous) or Qualitative or Categorical and ii) Continuous or Quantitative variables_explained_Qualitative_vs_quantitative Explanation of Terminology The multiple terminology that is presented in (a) and (b) points try to explain the different properties that a variable of the 1st and 2nd type can have by using different “view angles”. These terminologies are compared and analyzed below. Discrete (Non-Continuous) and Continuous variables i) Discrete Variables

Poisson Probability Distribution: A little History #Poisson #Probability #Distribution: Theoretical Definition The Poisson Probability Distribut

#Tuckey’s #Boxplox has been modified in order to present visually additional properties: i) The #Traditional Boxplot as it was described by Tuckey ii) #Variable Width Boxplot: The size of the sample defines the size of the “side” / width of the Boxplot iii) #Notched Box Plot: Notches emphasizes the size of the Median iv) #Violin plot: The perimeter (yellow one) shows the Probability Density (pdf) of the dataset / group v) Vase plot: The perimeter (yellow one) shows the Mod

What is statistics? – Bar chart | construction of bar chart, horizontal bar chart, vertical bar chart, stacked bar chart, side by side bar chart, bar chart construction

What is statistics? – Graph figures – Histogram | estatistics

#Focus Group: A little History The phrase “Focus group” was coined by the Austian-American Ernest #Dichter which was specialized in #Marketing #Psychology.

#Focus Group: A little History The phrase “Focus group” was coined by the Austian-American Ernest #Dichter which was specialized in #Marketing #Psychology. He made a focus group of children who watched television #advertisements and then he videotaped their reactions to these ads. The results of this Focus group led to the invention of “Barbie”. He specifically noted that: “What they wanted was someone sexy looking, someone that they wanted to grow up to be like,”“Long legs…