Warm up State whether the statement is Descriptive or Inferential. 1) Joanna Burgos, a spokeswoman for the GOP convention, said 13% of delegates this year are minorities. 2) Community colleges train 80% of the country's police officers, firefighters and emergency medical technicians and more than half of its new nurses and health care workers. 3) An estimated 5 million students are enrolled in ESL and workforce specific training, says the American Association of Community Colleges, who gets data from its 1,200 member schools.

SAMPLE vs. POPULATION A population is the set of all measurements A population is the set of all measurements A sample is any small group representing the population.

POPULATION PARAMETER: PARAMETER: the numerical measurement describing the population. the numerical measurement describing the population.

Of the 2,200 students surveyed 64% of the students at West Chester University drink throughout the week. Of the 2,200 students surveyed 64% of the students at West Chester University drink throughout the week. What is the population? What is the population? What is the parameter? What is the parameter? 2,200 64%

SAMPLE statistic statistic a numerical measurement describing the sample. a numerical measurement describing the sample.

14,000 high school students were interviewed nationwide and 8.4% of them have tried to commit suicide. This means that about one million students out of the 16 million nationwide may have tried to commit suicide. 14,000 high school students were interviewed nationwide and 8.4% of them have tried to commit suicide. This means that about one million students out of the 16 million nationwide may have tried to commit suicide. What is the population? What is the population? What is the sample? What is the sample? What is the parameter? What is the parameter? What is the statistic? What is the statistic? 16 million 14,000 1 mill / 16 mill 8.4%

Most studies are done using a sample. Most studies are done using a sample. BE CAREFUL WHEN CHOOSING A SAMPLE FOR A SURVEY BE CAREFUL WHEN CHOOSING A SAMPLE FOR A SURVEY If you want to know how many students come from divorced homes, can you just interview all the students at Sallies? If you want to know how many students come from divorced homes, can you just interview all the students at Sallies? If you want to know an average commute time to work, can you just interview your family and friends? If you want to know an average commute time to work, can you just interview your family and friends? Don’t limit your sample! You want it to be random!

With a partner With a partner To be handed in and graded To be handed in and graded Complete: Complete: Page #23 – 24 AND Page #23 – 24 AND Page #1 – 9 Page #1 – 9 FULL SENTENCE ANSWERS! FULL SENTENCE ANSWERS!