Math 120 - Intro to Statistics 2024

- correct answer--A(n) cluster sample is obtained by dividing the population into groups and selecting all individuals from within a random sample of the groups. - correct answer--A(n) stratified sample is obtained by dividing the population into homogeneous groups and randomly selecting individuals from each group. - correct answer--A(n) statistic is a numerical summary of a sample. A(n) parameter is a numerical summary of a population. - correct answer--Descriptive statistics consists of organizing and summarizing informationcollected, while inferential statistics uses methods that generalize results obtained from a sample to the population and measure the reliability of the results. - correct answer--What is a case-control study? Case-control studies are observational studies that are retrospective, meaning that they require individuals to look back in time or require the researcher to look at existing records. Which is the superior observational study? Why? Neither study is always the superior to the other. Both have advantages and disadvantages that depend on the situation. - correct answer--What is meant by confounding? Confounding in a study occurs when the effects of two or more explanatory variables are not separated. Therefore, any relation that may exist between an explanatory variable and the response variable may be due to some other variable or variables not accounted for in the study. What is a lurking variable?