Final Practice Problems - FR - Answers

# From part a from part a

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

This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: (from part a) ̂ (from part a) (̂ √ (̂ ̂ ) ( ̂ ) ( ) ( ̂ √ ) ̂ ̂ ( ̂ ) ) (̂ ̂ ) ( ) ( ) [0.002, 0.058] I am 99% confident that the proportion of people near the arctic circle that believe in global warming is between 0.002 and 0.058 greater than those near the equator. Final Practice Problems – Free Response - Answers Question 2 In 1900, the average adult male was 68.5” tall. In a recent random sample of 33 adult males, the average height was 69” with a standard deviation of 2”. a) Estimate the true mean height of adult males today with 90% confidence. ̅ ( ̅) √ √ ( ̅) ̅ ( ) [68.4, 69.6] I am 90% confident that the average height of adult males today is between 68.4” and 69.6”. b) Is there evidence at the 5% significance level that adult males have gotten taller since 1900? No; the average height in 1900 (68.5”) lies within the interval. More formally, with a hypothesis test… ( ̅) (from part a) (from part a) ̅ ( ̅) Final Practice Problems – Free Response - Answers ( ( ( ) ) ) There is not sufficient evidence to reject the null hypothesis...
View Full Document

## This note was uploaded on 02/25/2013 for the course PHYSICS 6c taught by Professor Miyagi during the Spring '11 term at UCLA.

Ask a homework question - tutors are online