﻿ Econ 6900: Homework #3, Dr. Usip, Economics

# Econ. 6900: Homework # 3       Dr. Usip

## Due Date: Last class before the Final                Note: No exam before the final as previously announced

I. Interval Estimation Problems
1
. (use SPSS/win)
The duration (in minutes ) for a sample of 20 flights-reservation telephone calls is shown in as follows:

 2.1 10.4 4.8 5.5 5.9 10.5 4.5 4.8 3.3 5.8 2.8 6.6 7.5 4.8 5.5 3.5 5.3 3.6 7.8 6

a) What is the point estimate of the population mean time for flight-reservation telephone calls?
b) What is the standard error of the estimator? Interpret its meaning.
c) Assuming that the population has a normal distribution, develop a 95% confidence interval for the population mean time.

2
. According to a USA Today poll (January 11, 1990), 79% of Americans say that, if they had evidence, they would turn in a relative who killed someone. Experts were not surprised  by the poll results, saying poll reflects " a socially desirable response" rather than real-life action. The telephone pool of 305 adults was conducted by the Gordon S. Black Corporation. What is the 95% confidence interval for the population proportion.

II. Hypothesis Testing Problems
3
. #51,  p. 363
4. #73,  p. 377 (use SPSS/win)

III. Regression Problems (use SPSS/win)
A. Simple Regression

Exercise13.2.1,  Problem #2 in the workbook, p. 85 (Use offrates.sav data file
(Note: The problem is actually on page 586 in the text)

B. Multiple Regression
Exercise 14.4.1, Problem # 5 in the workbook p. 90. (use the stroke.sav data file)

IV. Group Projects (use SPSS/win)
A. Simple Regression
Case problem 1 on page 87 of the workbook (use the naep.sav data file)

B. Multiple Regression
Exercise 14.4.2 (all parts) on page 93 of the workbook  (Use the fertility.sav data file)

Notes: (1) This is the last assignment; due data: last class before the final.
(2) No exam before the final.