e71_hw4_scan - The shading in the picture shows that on...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

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

Unformatted text preview: The shading in the picture shows that on some positive percentage of days, ( x- y ) < = x < y = Tamara sells less than Derek so while Tamara sells more than Derek on average , she does not sell more than Derek every day . B. Comparing Two Proportions 8.34 p 1 = proportion of all high-tech companies which offer stock options p 2 = proportion of all non-high-tech companies which offer stock options Sample Data n 1 = 91 x 1 = 73 b p 1 = 73 / 91 = . 8022 n 2 = 109 x 2 = 75 b p 2 = 75 / 109 = . 6881 Find a 95% confidence interval for ( p 1- p 2 ): (a) By formula: b p 1- b p 2 = s b p 1 (1- b p 1 ) n 1 + b p 2 (1- b p 2 ) n 2 = r ( . 8022)( . 1978) 91 + ( . 6881)( . 3119) 109 = . 0609 So a 95% confidence interval for ( p 1- p 2 ) is ( b p 1- b p 2 ) z * b p 1- b p 2 = ( . 8022- . 6881) (1 . 96)( . 0609) = . 1141 . 1194 = (- . 0053 to .2335) (b) By MINITAB : (- . 00530103 , . 233550) (c) Interpretation: We are 95% confident that between 0 . 53% fewer and 23.36% more high- tech companies than non-high-tech-companies offer stock options. 8.36 1. p 1 = proportion of all high-tech companies which offer stock options p 2 = proportion of all non-high-tech companies which offer stock options H A : p 1 6 =...
View Full Document

Page1 / 6

e71_hw4_scan - The shading in the picture shows that on...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online