This preview shows pages 1–3. Sign up to view the full content.
This preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
Unformatted text preview: Problem 3.7: The age values: 13, 15, 16, 16, 19, 20, 20, 21, 22, 22, 25, 25, 25, 25, 30, 33, 33, 35, 35, 35, 35, 36, 40, 45, 46, 52, 70. (a) Plot an equiwidth histogram of width 10. 1 2 3 4 5 6 7 8 9 010 1120 2130 3140 4150 5160 6170 (b) Give example of stratified sampling. Solution: Sample size =5. Strata’s to divide: young, middleage and senior. Let’s consider peoples with age: <30: young >30 and <60: middleaged >60: senior Total number of: Youngs: 15 Middleaged: 11 Senior: 1 Total: 27 Sample size is 5, i.e. 5/27 *100= 18.5% of total. Number of youngs in new sample= (15 * 18.5)/100 = 2.8 ≈ 3 Number of middleaged in new sample= (11 * 18.5)/100 = 2.03 ≈ 2 Number of seniors in new sample= (1 * 18.5)/100 = 0.18 ≈ 13 Young 15 Young 16 Young 16 Young 19 Young 20 Young 20 Young 21 Young 22 Young 22 Young 25 Young 25 Young 25 Young 25 Young 30 Young 33 Middleage 33 Middleage 35 Middleage 35 Middleage 35 Middleage 35 Middleage 36 Middleage 40 Middleage 45 Middleage 46 Middleage 52 Middleage 70 Senior Young Young Young Middleaged Middleaged New Sample of size 5. Problem L41: The age values: 13, 15, 16, 16, 19, 20, 20, 21, 22, 22, 25, 25, 25, 25, 30, 33, 33, 35, 35, 35, 35, 36, 40, 45, 46, 52, 70.33, 33, 35, 35, 35, 35, 36, 40, 45, 46, 52, 70....
View
Full
Document
This note was uploaded on 08/25/2011 for the course CPE 404 taught by Professor Merz during the Fall '09 term at Missouri S&T.
 Fall '09
 Merz

Click to edit the document details