STATISTICS QUESTIONS & ANSWERS

STATISTICS QUESTIONS & ANSWERS a block is a group of subjects that are similar, but blocks differ in ways that might affect the outcome of the experiment. - ANSWER: Randomized block design a numerical measurement describing some characteristic of a population - ANSWER: parameter a numerical measurement describing some characteristic of a sample - ANSWER: statistic A sample of n subjects is selected in such a way that every possible sample of the same size n has the same chance of being chosen - ANSWER: Simple random sample A study is conducted to measure children's growth rates without any treatment applied to the children. What best classifies this study? a. experiment b. discrete data c. observational study d. simple random sample - ANSWER: C Apply some treatment and then observe its effects on the subjects. - ANSWER: Experiment assign subjects to different treatment groups through a process of random selection. - ANSWER: Completely randomized experimental design Blinding allows us to determine whether the treatment effect is significantly different from a ____ - ANSWER: placebo effect careful - ANSWER: Categories only - ANSWER: nominal categories with some order - ANSWER: ordinal Characterized by data that consist of names, labels, or categories only, and the data cannot be arranged in an ordering scheme (such as low to high). - ANSWER: Nominal Collect data by using some combination of the basic sampling methods. Pollsters select a sample in different stages, and each stage might use different methods of sampling. - ANSWER: Multistage sampling Compare exactly two treatment groups using subjects matched in pairs that are somehow related or have similar characteristics. - ANSWER: Matched pairs design Consists of names or labels - ANSWER: Qualitative data Consists of numbers representing counts or measurements - ANSWER: quantitative data