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Below 5The formula for the test statistic depends on whether the population standard deviation (σ) is known or unknown. If σ is known, our hypothesis test is known as a z test and we use … Free Pre-Algebra, Algebra, Trigonometry, Calculus, Geometry, Statistics and Chemistry calculators step-by-step Get full access to all Solution Steps for any math problemAn absolutely free statistics calculator. MENU Home ... Problem Solvers. Statistics Calculator. Free Statistics Calculator. Enter data separated by either commas or semicolons. Calculate. Mode: Median: Mean (Average): Geometric Mean: Standard Deviation: Variance: Sum: Consider statistics as a problem-solving process and examine its four components: asking questions, collecting appropriate data, analyzing the data, and interpreting the results. This session investigates the nature of data and its potential sources of variation. Variables, bias, and random sampling are introduced. View Transcript. 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