** 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 |
6.0 |

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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Last revised: Wednesday, July 10, 2013.