Question

Based on basic statistics, discuss at least two of the following concepts from the perspective of psychology study:

• Descriptive versus inferential uses of statistics.
• Parametric versus nonparametric statistics.
• Normal distribution.
• Levels of measurement .
• Types of variables.
• Mean, standard deviation, variance, degrees of freedom, frequency, and sampling error.
• Data collection, transformation, screening, and reporting.
• Bivariate analysis.

Answer 1

Paramatric statistics is makes assumption about parameter of population distribution from which one data us drawn . Several condiition of realiblity and validity can be meet so that result of parameter test can be reliable . It is focused on interval and ratio scale. It requires more information for calculation. It is completely follow bell shaped curve . It has more statistical power .

In non parameteric test , there is no assumption about para meter of distribution. Non para metric test is applied even parametric condiition is not meet. Non para meteric test do not depend on normal distribution. It can even applied even it doesn't not full fill criteria of realiblity or validity. It is based on nominal and ordinal scale. It requires less information . But it does assumed of bell shape curve of normal distribution. It has less statistical power.  

LEVEL OF MEASUREMENTS :

nominal scale : it is used to identify group with out any quantitive value. It is based on name , catagory and label .

Ordinal scale mainly based on ranking or order . For example ranking of students of their performance in classroom .

Interval scale :

Here difference between two variable is meaningfull . It absolutely void true zero point.  The difference between a temperature of 100 degrees and 90 degrees is the same difference as between 90 degrees and 80 degreesj

Ratio scale :

There is clear definition of Zero . It have true zero value.