DSCI 3710 Exam1Fall2010Key_VerA

DSCI 3710 Exam1Fall2010Key_VerA - COURSE: DSCI 3710 Exam 1...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
1 COURSE: DSCI 3710 Print Name: Exam 1 Ver. A Signature: Key Fall 2010 Student ID#: INSTRUCTIONS: Please print your name and student ID number on this exam. Also, put your signature on this exam. On your scantron PRINT your name and exam version. You have 75 minutes to complete this exam. The exam is open book, open notes, and open mind. You may use any type of hand calculator but please show all your work on the exam and mark all answers on the scantron. Usage of cell phones, digital cameras, PDAs, and other communication devices is prohibited. Please DO NOT pull this exam apart. When you have completed the exam, please turn your scantron and exam booklet into your instructor, at the front desk. Good luck and we wish you well on the exam. Note: Whenever question(s) are connected you may be asked to assume a result (given a value) as an answer for the previous question but this result (value) may or may not be correct. The procedure is set in place to prevent you from losing points on a subsequent question because you made a mistake on some previous question/s.
Background image of page 1

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

View Full DocumentRight Arrow Icon
2 Use the following paragraph for the next five questions. The U.S. Census Bureau conducts annual surveys to obtain information on the percentage of the voting-age population that is registered to vote. Suppose that 724 employed persons and 596 unemployed persons are independently and randomly selected, and that 465 of the employed persons and 306 of the unemployed persons have registered to vote. Can we conclude that the percentage of employed workers () p 1 , who have registered to vote, exceeds the percentage of unemployed workers () p 2 , who have registered to vote? Use a significance level of = 0.05 for the test. The KPK Macro output is shown below. Z Test for Two Proportions Employed Unemployed Sample Proportion 0.642265 xxxxxxxx Number of Observations 724 596 Ho:xxxxxxx Ha:xxxxxx Z* 4.726338 P[ Z Z*] 0.000001 Z Critical, = 0.05 xxxxxxx 95% CI for p1 p2 0.075610 to 0.182075 1. What is the null hypothesis for the test? A. p 1 < p 2 B. p 1 p 2 C. p 1 > p 2 D. p 1 < p 2 * E. p 1 = p 2 2. What is the point estimate of the proportion of unemployed persons who have registered to vote ? A. 0.642 B. 0.584 C. 0.075 D. 0.182 E. 0.513* 3. What is the critical (table) value for the test statistic? A. 1.282 B. 1.33 C. 1.645* D. 1.96 E. 2.33
Background image of page 2
3 4. What is the estimated pooled proportion ( p ) of voting-age population registered to vote? A. 0.642 B. 0.584* C. 0.075 D. 0.182 E. 0.513 5. Let us assume instead that we were interested in testing whether there was a difference in the percentage of employed workers () p 1 , who have registered to vote versus the percentage of unemployed workers () p 2 , who have registered to vote. Then, based upon the 95% confidence interval as given in the KPK output, what would be the conclusion of our hypothesis test and the reason for the conclusion? A.
Background image of page 3

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

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 03/07/2011 for the course DSCI 3710 taught by Professor Dr.jay during the Spring '08 term at North Texas.

Page1 / 10

DSCI 3710 Exam1Fall2010Key_VerA - COURSE: DSCI 3710 Exam 1...

This preview shows document pages 1 - 4. Sign up to view the full document.

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