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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 | 6.0 |
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.
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Copyright© 1996, Ebenge Usip, all rights reserved.
Last revised: Wednesday, July 10, 2013.