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Question 1: Hypothesis Test for US Public Transportation Year | Percent of Public Transportation | 1997 | 4.6 | 1999 | 4.9 | 2001 | 4.7 | 2003 | 4.4 | 2005 | 4.7 | 2006 | 4.8 | 2007 | 4.9 | 2008 | 5.0 | 2009 | 5.0 |
1/ Less than 5% of US citizens use public transportation according to several websites of U.S. Departments of Transportation Survey.

= 4.778
SD = 0.199 n = 9

The test statistic: t= = = 71.276

We have enough evidence to reject H0

Thus, we have sufficient evidence to prove that less than 5% of US citizens use public transportation.
Base on the data, in 2008 and 2009, the percentage of people who used public transportation was the highest (5%). Because of the development of the world in general and the U.S in particular, people in U.S prefer using bus, streetcar, subway, railroad, and elevated trains. In 1999 and 2007, there had high rate of proportion of residence using public transportation (4.9%) perhaps because of the population explosion. There were also 4.6% in 1997, 4.7% in 2001 and in 2005, and 4.8% in 2006 respectively.

Resource:
U.S. Department of Transportation
Research and Innovative Technology Administration
Bureau of Transportation Statistics
National Transportation Statistics http://www.bts.gov/publications/national_transportation_statistics/2010/html/table_01_38.html Question 2: Multiple Regressions
We take the data from OSEVEN Company (www.oseven.vn)

The result of the Regression for the percentage:

According to the result of the Regression, we get the regression equation:
Y=0.023+0.097 X1+0.165 X2+0.187 X3
Prediction:
X1 (Advertisement 1) | 5% | 71257717 | X2 (Advertisement 2) | 4% | 90864944 | X3 (Advertisement 3) | 11% | 74889282 | Y (Revenue) | 5% | 26641682106 |
Question 3: Case 11 – Rating Wines
We assume the independent random samples and the normally…...

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