Seth Marinello

Stat321

1) Problem 5 (p. 10)

A: The relevant conceptual population is the students to take the SI course along with the Statistics course.

B: If the students are allowed to choose which group to join then the individual opinions of their ability to master the material or other personal factors could skew the data, such as all the lazy students not wanting to do the extra work in the SI course.

C: If all the students we in the SI group there would be no data from that course to compare against.

2) Problem 14 (p. 23)

A: Stem-and-Leaf Display: Rate

Stem-and-leaf of Rate N = 129

Leaf Unit = 0.10

2 2 22

12 3 2244557779

20 4 00355889

37 5 00000004455555689

62 6 0000011113344455556689999

(17) 7 00001133455555558

50 8 01133338

42 9 011133335666688

27 10 1333355688

17 11 1335888

10 12 36

8 13 8

7 14 36

5 15 0035

1 16

1 17

1 18 8

B: 7.5

C: Generally concentrated around 4-9

D: I would say it is negativly skewed because of the slope coming dowing from 6 to 18

E: If there is an outlier it would be 18, but htat number isn't that far from the 5 at 15 in my opinion.

3) Problem 41

A: x/n = 7/10 = .7

B: x = .7 = x/n

C: .8 * 25 = 20 for x

4) Find 2 uses of statistics (e.g., in the news, on the web, from other courses).

(a) Give the complete reference

A: http://www.dartmouth.edu/~chance/chance_news/current_news/current.html#item8

B: http://www.dartmouth.edu/~chance/chance_news/current_news/current.html#item8

(b) Explain what the article means

- What are they measuring?

A: They are measuring the relation between smoking and death in older people

B: They are looking at relation between presidental approval and the threat of terror.

- What conclusions did they come to?

A: Those who smoke have around a 20% higher death rate than those who don't in the 51-64 age group.

B: The approval of the Bush administration was helped by terror during 9/11, but recently those who fear attacks are less impressed with the President.

(c) Evaluate their results

- Do the authors do a good job of explaining what’s involved?

A: Yes, I like the numerous graphs provided.

B: Yes, the linked PDF is very detailed but understandable.

- Do the conclusions follow from the information given?

A: Yes the data and idea correspond well.

B: Yes, same as above, though the data is not presented in as straitforward a manner.

- What additional information would you like to have?

A: I would like a more specific break down of ages.

B: I would like them to have integrated the graphs into the body of the document.

2005-01-06T21:10:41