Finding the quartiles in statistics
STATISTICS: Sect - Plain Local
Quartiles. Works similarly to the percentile, with the difference the percentage divides the data set in four equal-sized groups. There is a relationship between quartiles and percentiles: Table 3. Relationship between quartiles and percentiles. 1st. quartile( 25th percentile 2nd. quartile( 50th percentile MEDIAN 3rd. quartile( 75th percentile 4th.
[DOC File]STATISTICS IS THE STUDY OF DATA - De Anza College
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Quartiles – First Quartile – Second Quartile – Third Quartile – Interquartile Range – Box-and-whisker plot – Standard score (or z-score) – Chapter 3 Vocabulary – Probability. Write a definition in your own words. Give an example when applicable. Section 3.1 – Basic Concepts of Probability. The Fundamental Counting Principle –
[DOC File]DESCRIPTIVE STATISTICS
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Finding Outliers: Report the lower and upper quartiles of the variable Population. Q 1 = _____, Q 3 = _____. Based on those quartiles, any state with population beyond _____ would be considered an outlier in terms of population size (Hint: use the procedure described on …
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Finding the Quartiles. Find the median of all of the observations. First Quartile = Q1 = median of observations that fall below the median. Third Quartile = Q3 = median of observations that fall above the median. Notes. When the number of observations is odd, the middle observation is the median.
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The quartiles would then be Q3 = 125 (the average of 120 and 130) and Q1 = 23.5 (the average of 19 and 28), with an IQR of 125 – 23.5 = 101.5. Interpretation: The IQR of a data set represent the range of the “middle” 50% of the data.
Quartile Calculator | Interquartile Range Calculator
20 Finding the Quartiles . Find the median of all of the observations. First Quartile = Q1 = median of observations that fall below the median. Third Quartile = Q3 = median of observations that fall above the median. Notes When the number of observations is odd, the middle observation is the median.
[DOC File]A statistic is a characteristic or measure obtained by ...
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Here are examples that show how the rules for the quartiles work for both odd and even numbers of observations. Example . Finding the quartiles: odd number of observations. Here are the travel times in minutes for 15 workers in North Carolina, chosen at random by the Census Bureau: 30 20 10 40 25 20 10 60. 15 40 5 30 12 10 10
[DOC File]Chapter 1--Sampling and Descriptive Statistics
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Look at the statistics for the center, quartiles, and extreme values, and the spread of the data. Discuss differences and/or similarities you see regarding the location of the data, the spread of the data, the shape of the data, and the existence of outliers. ... Finding values further than 2 or 3 standard deviations from the mean is ...
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Then draw an appropriate scale and make the boxplot. The minimum, median and maximum should not be difficult to find. Finding the quartiles is more work: (1) First, make sure numbers are in increasing order. (2) Locate the median (or solve for the median) (3) To find Q1 (first quartile): Find the median of ALL values that are below the median.
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Students research a data set of interest to them, and then calculate statistics including mean, mode, range, quartiles and inter-quartile range; e.g. local prices of recently sold houses or prices of a car they are interested in buying.
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