Essential Statistics 3rd Edition

MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) To study the effect of air pollution on respiratory health, a group of people in a city with high levels of air pollution and another group in a rural area with low levels of pollution are examined to determine their lung capacity. Is this a randomized experiment or an observational study? A) randomized experiment B) observational study Answer: B 2) Choose the answer below that best completes the following statement. 1) 2) A _________is a number that describes a population. A) sample B) statistic C) summary D) parameter Answer: D 3) A ________ is a subset of a population. 3) A) simple random sample B) sample C) cluster D) sample of convenience Answer: B 4) An experiment that tends to overestimate or underestimate the true value is said to be ______________. A) biased B) flagrant C) randomized D) un-randomized Answer: A 5) In a ________ experiment, subjects do not decide for themselves which treatment they will get. A) prospective B) observational C) randomized D) double-blind Answer: C TRUE/FALSE. Write 'T' if the statement is true and 'F' ifthe statement is false. 6) Determine whether the statement is true or false. In a case-control study, the outcome has occurred before the subjects are sampled. Answer: True False MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.