BCOR 1025 Study Guide - Midterm Guide: Conditional Probability, Mutual Exclusivity, Exponential Distribution
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Descriptive statistics: way of describing populations or samples graphically or numerically, first half of the semester. Inferential statistics: drawing conclusions about a population by analyzing a sample from that population. Sampling frame: listing of the research population from which you"ll draw your sample. The value is fixed (but often unknown) as long as the population stays the same. Statistic values change from sample to sample, even when the population stays constant: usually, a statistic is an estimate for a parameter. Quality: ho(cid:449) (cid:449)ould (cid:455)ou rate u(cid:374)ited(cid:859)s (cid:272)usto(cid:373)er ser(cid:448)i(cid:272)e: terrible, poor, adequate, good, excellent. Commonly considered ordinal: there is a logical order, values measured not numerical. But sometimes a (cid:862)special case of i(cid:374)terval data(cid:863) If and only if verbal anchors chosen carefully. Each observation in the sample represents a different equally spaced point in time (e. g. , years, months, days). Sales, market share, product quality ratings, unemployment rate. Cross-sectional is data collected at a single point in time.
