Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: ect H0, your results are not significant. 7 Z‐Test for a Population Mean To test the hypothesis H0: = 0 based on an SRS of size n from a population with unknown mean and known standard deviation , Z0 x 0 / n compute the test statistic: the P‐values for a test of H0 against: Ha: > 0 is P( Z Z0) Ha: < 0 is P( Z Z0 ) Ha: 0 is 2* P( Z | Z0| ) These P‐values are exact if the population is normally distributed, and are approximately correct for large n in other cases. 8 EXAMPLES 1. Last year the government made a claim that the average income of the American people was $33,950. However, a sample of 50 people taken recently showed an average income of $34,076 with a population standard deviation of $324. Is the government’s estimate too low? Conduct a significance test to see if the true mean is more than the reported average. Use an =0.01. 2. An environmentalist collects a liter of water from 45 different locations along the banks of a stream. He measures the amount of dissolved oxygen in each s...
View Full Document

This note was uploaded on 10/09/2012 for the course STAT 301 taught by Professor Staff during the Spring '08 term at Purdue.

Ask a homework question - tutors are online