O'Reilly logo

The Complete Idiot's Guide to Statistics, 2nd Edition by Robert Donnelly

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

Example of a Two-Tail Hypothesis Test

I stated the hypotheses for the snake example as:
H0 :µ=6.0 days
H1:µ≠6.0 days
Where m = the mean number of days to catch a loose snake in a home.
 
Let’s say that I know that the standard deviation of the population, σ, is 0.5 days, and my sample size to test the hypothesis, n, is 30 homes. (Please don’t ask me how I’m going to find 30 homes with loose snakes. I’m making this up as I go along, so just humor me.) We’ll also set α = 0.05, which means I’m willing to accept a 5 percent chance of committing a Type I error. Our first step is to calculate the standard error of the mean, σ x . If you remember from Chapter 13, the equation is:
Let’s assume the sample mean from the 30 homes is 6.1 ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required