Question

1-According to a USA Today/Gallup poll conducted at the beginning of 2010, after the Haiti earthquake, 63% of Americans favored leaving American troops in Haiti until basic services were restored. Results were based on telephone interview with 1067 American adults aged 18 or older.
a. What is the population being studied?   
b. What is the sample?   
c. What are the sample statistics?   
d. Describe any potential bias.  

2- Eighty-nine percent of Americans polled are in favor of arts education being taught in public schools.
a. Does the above numerical value describe a parameter or a statistic?  
b. After reading the above statement, you decide to campaign for the arts in education and use the statement: “A majority of Americans are in favor of art education, which shows their love of arts. Americans support ballet teaching in public schools.” What branch of statistics would you be applying.  

Answer 1

A) The population is the american people

B) The sample is 1067 american adults aged 18 or older.

C) Sample statistics are:

Proportion = 0.63

N = 1067

Sample mean = n*p = 672.21

Variance = npq = 248.72

D) A potential bias could be that only those people were surveyed who had a telephone and the sample didn't have anyone who didn't have. This could lead to biasedness of the results.

2. A) It is about a population. Hence, it is a parameter.

B) Inferential statistics as we are inferring something from the data.