A poll was taken of 150 students at De Anza College. Students were asked how many hours they work outside ofcollege. The students were interviewed in the morning between 8 AM and 11 AM on a Thursday. The samplemean for these 150 students was 9.2 hours.

a. What is the Population?
b. What is the Sample?
c. Does the 9.2 hours represent a statistic or parameter? Explain.
d. Is the sample mean of 9.2 a reasonable estimate of the mean number of hours worked for all students at DeAnza? Explain any possible bias.