A student would like to estimate the mean length of words in a book report he just finished writing. He selects a random sample of 20 words and determines the mean length to be 4 characters. Later, he discovers how to use a built-in function of his word-processing program that reveals that the mean length of all words in his book report is 4.3 characters. Which of the following statements is true?
Answer
A
The population is all words in the book report and the sample is the random sample of 20 words.
B
The population is the random sample of 20 words and the sample is all words in the book report.
C
The population is the mean length of all words in the book report and the sample is the mean length of the 20 randomly selected words.
D
The population is the mean length of the 20 randomly selected words and the sample is the mean length of all words in the book report.