Problem Set 3

# Problem Set 3 - III Sumof(Days*prob)=3 Sumof(prob)=1.05...

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

Corey Cohen Lawrence Assignment 3 11/16/08 1. Descriptive Statistics a. 99.2-Mean, 98.5-Median, b. 99.2 c. 98.5 d. It decreases in both circumstances. The n is increased in the denominator which makes the top divisible by a larger number. When that happens the outcome is smaller. The outcome is the standard deviation that is squared. e. You cannot increase the standard deviation in the data by adding an observation. II . 0.975 * (1-0.04) = 93.6% Chance that person identified is actually a terrorist.
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: III. Sumof(Days*prob)=3 Sumof(prob)=1.05 Expected value=3/1.05 =2 . 85714 IV . No. She needs a 166.449 (~166) to be in the 95 th percentile, her score puts her in the 93.1843% percentile. If her friend had a percentile score of 83.1843, her score comes to approximately 160. V . a) Sample mean=76 1.96(S x /sqrt(529))=2 S x = 23.4694 SE x =23.4694/sqrt(529) = 1.02041 b) Z 0.2/2 =1.28 76 +/- 1.28(23.4694/sqrt(529)) = [74.6939, 77.3061]...
View Full Document

## This note was uploaded on 10/13/2010 for the course PSC 101 taught by Professor Lawrence during the Fall '08 term at GWU.

Ask a homework question - tutors are online