Spring2003FinalB

Spring2003FinalB - COURSE: MSCI 3710 Print Name: Final Exam...

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
I. Use the information given in the following paragraph to answer the next three questions. (Kvanli Chapter 9) A recent commercial claims that the international phone call rates offered by IDT are lower than those of MCI. A consumer decided to test this claim by collecting and analyzing data from IDT’s and MCI’s Web sites ( www.idt.net , www.mci.com ). The rates offered by each company, in cents per minute, for international calls from the U.S. to 14 selected countries and their statistical analysis are listed below. Is it true that IDT rates are lower? Country MCI IDT Argentina 19.0 20.0 Brazil 19.0 20.0 Canada 5.0 5.0 China 17.0 16.0 France 12.0 7.0 Germany 12.0 7.0 Greece 12.0 17.3 India 33.0 59.0 Israel 15.0 11.0 Italy 12.0 7.0 Japan 14.0 9.0 Mexico-1 10.0 19.0 Russia 23.0 19.0 U.K. 10.0 7.0 t-Test: Paired Two Sample for Means, alpha = 0.05 MCI IDT Mean 15.21429 15.95 Variance 46.95055 186.12731 Observations 14 14 Pearson Correlation 0.867511 Hypothesized Mean Difference 0 df ---- t Stat -0.32696 P(T<=t) one-tail 0.374452 t Critical one-tail 1.770932 P(T<=t) two-tail 0.748903 t Critical two-tail 2.160368 1. What are the decision and conclusion using a dependent samples t-test if the test is conducted at the 5% significance level? A. There is insufficient information to decide whether IDT rates are lower. B. Fail to reject the null hypothesis, conclude IDT rates are lower. C. Reject the null hypothesis, conclude IDT rates are not lower.
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 03/09/2011 for the course DSCI 3710 taught by Professor Dr.jay during the Spring '08 term at North Texas.

Page1 / 11

Spring2003FinalB - COURSE: MSCI 3710 Print Name: Final Exam...

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

View Full Document
Ask a homework question - tutors are online