Math390

Math 390

Statistics for Engineers lol

Course Website. We’ll be using R.

1/7/2008 - first lecture

There’s a dude wearing a motorcycle tshirt in two of my classes. He’s a real gunner, questioning the Stat prof on the viability of his field of research (“You make these claims, but are they verifiable?”). What a gomer. I want to mouth punch him already.

Two types of statistics: Descriptive and Inferential. Descriptive statistics refers to mean, median, mode, range, and charts like histograms and scatterplots. Inferential refers to using statistical arguments to make statements about a population from a sample. “I reject the null hypothesis!”

Defining functions

A density function has the following requirements:

  • Positive definite- i.e. {$ f(x) \geq 0 $}
  • {$ \int_{-\infty}^{\infty} f(x)dx = 1 $}

A mass function has the following requirements

  • {$ p(x \geq 0 $}
  • {$ \sum_x p(x) = 1 $}