**PUB/POS 316 -
Spring 2010**

**Assignments**

**1. Research design
Chapter 3 ( §3) Introduction:** 3.2, 3.4, 3.6, 3.7, 3.8

**2. Data summaries & displays**
[If you don't have the text's data CD, you can click on the live links below to
download the necessary data sets. Let me know if any of these links point to
the wrong data.]

**§1.1: **Use Excel to create the bar graph and pie chart in Fig. 1.3
from data on p. 6;

- Use Excel to create Fig. 1.4 from data in table 1.1. (Hint: enter the data
set in one column in an excel spread sheet, write a proper bins array
[categories], find frequency for each category, draw the graph)

- By hand create stemplots for the data in Table 1.2 (one stemplot for *male
percent* and one for *female percent*). What stories can you tell from
your plot?

-1.5 (by hand), 1.6, 1.7, 1.8, 1.10, 1.12, 1.17, 1.21, 1.34 (*ex01-034*)

**§1.2:** 1.47, 1.48, 1.49, 1.50, 1.51, 1.52, and 1.53 "by
hand." Check with Excel.

- 1.61 (by hand [median = middle; quartiles are medians of upper and lower
halves], 1.63 (*ta01-005*), 1.65

**§1.3** - skip

**End of chapter 1 exercises:** 1.160.

.

**3. Scatterplots, regression and correlation
as data displays and summaries**

**§2.1:** Replicate Example 2.6 (sctterplot of SAT scores *eg02-006*)

- 2.9, 2.25 (*ta02-003) *

**§2.2: **2.30 (*ex02-030*), 2.31 (*ex02-031*). (Comment on the scatterplot patterns,
R-squared and the size of the correlations.)

- 2.42.

**§2.3: **2.57, 2.63

**§2.4:** 2.85 (*ex02-085*)

- 2.96 (*ex02-096) *You can compute the correlations
in part (b) just by finding the square root of R-squared and putting on the
correct sign.)

**4. Two-way tables .
§2.5:** In these exercises you are using bar charts to help tell stories
about the data.

- 2.111 [Just type in this data in an Excel spreadsheet (the text's Excell file for this data is not arranged like the table in the the statement of 2.111 and is not very helpful); for part (c) use a bar (or column) chart],

- 2.112 [to display this distribution, you don't have to make a new chart -- you can just use the chart set up for 2.111 and ask for a stacked bar chart],

- 2.113 [here again, you can use the same chart and tell Excel to "sort by" rows -- I found the command in the "chart data" part of the formatting palette]

**5. Case I: Presenting data
**

**6. Normal Distribution and sample means **

[Note: When the book says a distribution is N(x,y), it means it is 1) it is normally distributed, 2) the mean is x, and the standard deviation of y]

**§1.3:** **
**Draw a normal distribution graph to illustrate how many hours a day you
sleep,

**§5.2:
**5.42 (hint: the Central Limit Theorem), 5.48, 5.58 (only a)

**7. Proportions and Confidence intervals **

**§5.1 Proportions:
**5.22, 5.23, 5.24

**8. Hypothesis testing**

**§6.2:
**6.50, 6.52, 6.55, 6.56, 6.58, 6.59, 6.64, 6.68, 6.71, 6.73

§6.3:

** 9. Inferences
for mean and proportions**

**§7.1 Means:
**7.8 (p.431), 7.9, Example 7.9 (p.434), 7.34

**§7.2: Comparing two means
**Example 7.14 (p.452), 7.61.

**§8.1 Proportions:
**8.11, 8.14 [for (b), Compute a confidence interval and see if it overlaps
with (a); ignore the sentence about "P-value"]

8.17 [ignore the "Challenge" label -- should be do-able], 8.18, 8.32

Do 8.41 using the method in this section, e.g., Example 8.9. Redo 8.14 using the method in 8.2 for comparing two proportions.

**10. Inferences –
Understandings: **

Read these two studies (1, 2). Write a half a page report for each of them (typed – double spaced). Be ready to discuss them in the class.

**11. Analysis of two-way tables (chi-square and
crosstabs), Regression**

**§9.1 & 9.2
**Exercises begin on p. 548: 9.7 (can you still do these graphs!?), 9.9,
9.12, 9.20, 9.35

**§10.1 & 10.2:** Exercises begin on p.
594: 10.6, 10.8, 10.9, 10.10 (Table for 10.10 : ta10_001).

**12. Case II: Air Pollution and Mortality **

**13. Optional Assignment - ONLY one of these options :**

__Option 1__ : Chapter 1: 1.63, 1.103, chapter 2:
2.30, 2.63, 2.111, 2.112, chapter 3: 3.28, 3.102, Chapter 10: 10.11

OR

__Option 2__: Answer to the second test questions.

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