In a sample of 3,200 registered voters, 1,440, or 45, approve of ...

[ec501234]

In a sample of 3,200 registered voters, 1,440, or 45, approve of the way the president is doing his job. A political pollster states, Forty five percent of all voters approve of the president. This statement is an example of _____.
 a. a sample
  b. descriptive statistics
  c. statistical inference
  d. a population

Question 2

From a population of 500 elements, a sample of 225 elements is selected. It is known that the variance of the population is 900 . The standard error of the mean is approximately
 a. 1.1022
   b. 2
   c. 30
   d. 1.4847

[jordangronback]

Answer to Question 1

c

Answer to Question 2

d