QUESTION 11

• Questions #10 - #12 are based on the following study: Professor Bravo interviewed a sample of 1000 families. Using simple random sampling from each state, she used a directory of cell phone numbers to call participants and measured their literacy.The average household income of her participants was $45,000.The US census data recorded this year determined that the average income of the entire population of families in the United States is $24,000. The second problem in Professor Bravo's study is that she is sampling an equal number from each state. What sampling plan could she use to ensure that her next experiment samples a different percentage from each state according to the demographic breakdown of the whole country?

		stratified random sampling
		proportionate stratified random sampling
		convenience sampling
		simple random sampling