Question

adriana, henry, malik, and richard each design surveys to determine the most popular way seventh graders purchase music. adriana samples the five friends sitting at her lunch table. henry samples every boy in his homeroom class. malik samples every student using an mp3 player while waiting for the bus. richard samples the first student alphabetically on the class roster from each of 12 classes. which sample is likely to produce the most valid results?
richards sample
adrianas sample
henrys sample
maliks sample

Explanation:

Step1: Analyze sampling bias

Adriana samples only her five friends (biased - limited social circle). Malik samples only seventh - graders (biased - grade - specific). Henry samples only boys (biased - gender - specific). Richard samples from each of 12 classes (unbiased - diverse class representation).

Answer:

Richard's sample