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Stat Test 1
Question | Answer |
---|---|
what is statistics? | Statistics is the science of collecting, organizing, summarizing, and analyzing information to draw a conclusion and answer questions. In addition, statistics is about providing a measure of confidence in any conclusions |
Explain the difference between a population and a sample. | A population is the entire group that is being studied while a sample is a subset of the population that is being studied. |
Descriptive statistics | consists of organizing and summarizing information collected |
inferential statistics | uses methods that generalize results obtained from a sample to the population and measure the reliability of the results. |
A(n) statistic | is a numerical summary of a sample. |
A(n) parameter | is a numerical summary of a population |
Determine whether the underlined value is a parameter or a statistic. Upper A study of 6 comma 076 adults in public rest rooms found that Modifying 23 % with underline did not wash their hands before exiting. | The value is a statistic because the 6 076 adults in public rest rooms are a sample. |
Explain what is meant when it is said that "data vary". How does the variability affect the results of statistical analysis? | means that the values of the variable change from individual to individual. Because data vary, two different statistical analysis of the same variable can lead to different results. |
What is an observational study? | An observational study measures the value of the response variable without attempting to influence the value of either the response or explanatory variables |
What is a designed experiment? | designed experiment is when a researcher assigns individuals to a certain group, intentionally changing the value of an explanatory variable, and then recording the value of the response variable for each group |
What is meant by confounding? | 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? | A lurking variable is an explanatory variable that was not considered in a study, but that affects the value of the response variable in the study. In addition, lurking variables are typically related to explanatory variables in the study. |
What is a confounding variable | A confounding variable is an explanatory variable that was considered in a study whose effect cannot be distinguished from a second explanatory variable in the study. |
What is a frame? | A frame is a list of the individuals in the population being studied. |
Which sampling method does not require a frame? | Systematic |