Dave has been collecting data on how many cups of coffee college students are drinking per week. After surveying 10 students (=10), Dave got the following data: {9,9,9,5,5,5,2,2,2,2}
Calculate the standard unbiased from Dave's dataset. Please round your answers to 2 decimals. stdunbiased = number ( 2 significant figures)
Calculate the standard error of Dave's dataset. Please round your answers to 2 decimals. stderror = number ( 2 significant figures)
Dave hopes to reduce the standard error to at most 0.1 (less than or equal to 0.1). Suppose the standard unbiased hasn't changed. How many students will Dave have to sample in total at the least? (What will the value for "" be?) =