A student would like to estimate the proportion of students at his school who have lunch during period 4. To do so, he selects a random sample of 40 students and finds that 30% of them have period 4 lunch. Later, he goes to the guidance office and finds that of the 380 students at this school, 25% of them have period 4 lunch. Which of the following properly describes the number, 25%?
The 25% was calculated using all 380 students at the school, so it describes the entire population. A number that summarizes a population is called a parameter. The 30% from the random sample of 40 students is the statistic.
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