Week 1 Rescue: Data, Studies, and Visual Summaries

Identify the population, sample, parameter, and statistic in a study description.

Classify a variable as categorical or quantitative and, when quantitative, as discrete or continuous.

Determine whether a variable uses the nominal, ordinal, interval, or ratio level of measurement.

Classify a study as an experiment or as a cross-sectional, retrospective, or prospective observational study.

Evaluate a sampling procedure by identifying its method and a likely source of bias.

Construct a grouped frequency distribution by selecting a class width and class limits.

Calculate relative and cumulative frequencies from a frequency distribution.

Interpret a histogram by describing its shape, skewness, gaps, likely outliers, and approximate normality.