• descriptive and inferential statitics

  • Population and sample

  • Sampling techniques

  • Variables and types of variables

  • Variable measurement scales

  • Bar charts vs Histogram

  • Arithemetic mean for population and sample , and , difference between mean, average and mode

  • variance and standard deviation

  • why sample varience is divided by n - 1

  • decision and reality check

  • Interval and ratio

  • skewness

  • kurtosis

  • skewness and kurtosis

  • difference between Z-score and IQR

  • Binomeal distribution

  • poisson distribution

  • exponential distribution

  • PMF, PDF, CDF

  • central limit theory