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[DOC File]Numerical Measures of Central Tendency
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Empirical Rule: For data having a mound-shaped distribution, ... Percentiles are numbers that divide the ordered data into 100 equal parts. The p-th percentile is a number such that at most p% of the data are less than that number and at most (100 – p)% of the data are greater than that number. ... A different rule of thumb is to consider a ...
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[DOC File]DESCRIPTIVE STATISTICS
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Apply the formula for percentiles to locate the percentile you are interested in: e.g. If there are 20 students in your class, and you are in the 90th percentile of the class based on the grades, by replacing the 90 in the formula you will find out that you are in position 18.90 However decimals don’t make much sense for a location, so we ...
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[DOC File]Exercise 13
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Still use the normal distribution to find the probability. Use Empirical rule to find the probability. Use Chebyshev’s inequality to find the probability. We have not learned anything in class to solve such a problem. STAT 211 EXAM 2 – FORM A FALL 2004
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[DOC File]AP STATISTICS: Sect
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Empirical Rule . to see if approximately 68% of all data points are within μ ± 1σ, 95% of all data points are within μ ± 2σ, and 99.7% of all data points are within μ ± 3σ. In general, this rule works well for large data sets, but not so well for small sets. a (2) Use the . normal probability plot
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[DOC File]JMP TUTORIAL #1 - DESCRIPTIVE METHODS FOR …
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Percentiles/Quantiles (percentiles and quantiles are the same thing) The kth percentile or quantile, Pk, is a value such that k % of the values are less than Pk and (100 – k)% are greater in value. ... Empirical Rule for z-scores of Normally Distributed Variables. About 68% of …
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[DOCX File]Describing and Interpreting Data
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The Empirical Rule. Apply this rule to interpret the measures when the data is symmetrical. At least: 68% of the data values are within one standard deviation of the mean: µ ± 1𝞼 ... Percentiles . A percentile is a location marker along a range of values. The 50th percentile is …
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[DOC File]Z-Score Practice Worksheet
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Percentiles and Z-score. Please show all work on a separate piece of paper. 1. Shoes. How many pairs of shoes do students have? ... Find an interpret the percentile in the female distribution for the girl with 22 pairs of shoes. ... Use the Empirical Rule to answer the following questions. a) What percent of men are taller than 74 inches? ...
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[DOC File]Z-Score Practice Worksheet
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Find the range of values that defines the middle 80% of the distribution of SAT scores (372 and 628). Find the z-scores - -1.28, 1.28. For a normal distribution, find the z-score that separates the distribution as follows: Separate the highest 30% from the rest of the distribution. .52. Separate the lowest 40% from the rest of the distribution. .25
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[DOC File]Unit 1 – Exploring and Understanding Data (25 Days)
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Empirical Rule (68-95-99.7 Rule) Tables of Normal percentiles to calculate probabilities for a Normal Model and to find z-scores for a given percentile. Assessing Normality. Normal Probability Plots. TI: Finding Normal Percentages, Finding Normal Cutpoints, Creating a Normal Probability Plot. Assignments: Read Chapter 6 pgs 104-129
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[DOC File]Chapter 1
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Define: percentiles, quartiles, deciles, empirical rule. Know the difference between a parameter and a statistic. Be able to list the measures of central tendency, the measures of variation, and the measures of position. 23. Find the z score for each student and indicate which one is …
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Empirical rule to find percentiles