Calculate third quartile
[DOCX File]Describing and Interpreting Data
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Calculate by summing the values and dividing by n (the total number of values) population. or by n-1 for a . ... The Interquartile Range measures the spread in the middle 50% of the data and is the third quartile minus the first quartile. The IQR is a measure of variability that is …
[DOC File]Ways to Measure Central Tendency
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Estimate the first quartile of the distribution. Estimate the third quartile of the distribution. What is the Interquartile Range of the distribution? Standardized Score (z-score) Calculation. Definition. Problem 3 - Test Scores. a) Suppose the mean score on a stats exam is 80 and the standard deviation is 6.07.
[DOC File]Describing Data - OpenTextBookStore
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To find the first quartile, we calculate the locator, L = 0.25(36) = 9. Since this is a whole number, we know Q1 is the mean of the 9th and 10th data values, $250 and $260. Q1 = $255. To find the third quartile, we calculate the locator, L = 0.75(36) = 27.
[DOC File]3 - Faculty Websites
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Calculate the third Quartile Q3 for this age data. Calculate the range for this age data. We see that the distribution of age is approximately symmetric and that the …
[DOC File]Lab #3 – Normal Distribution & Confidence Intervals
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b) Calculate the IQR (3rd Quartile ( 1st Quartile) and discuss whether there are any outliers . in either data set based upon the criteria that are beyond 1.5IQR below Q1 or 1.5IQR . above Q3. c) For each of the data sets using methods of normal probability find the values that
[DOC File]Calculation of Inter-Quartile Range (IQR)
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The inter-quartile range is the range in which the middle 50% of the data points fall (i.e. the distance between the 1st and 3rd quartile) and would be calculated as follows for the above data set: 25% of n = 25% x (n+1) = 0.25 x 9 = 2.25. Therefore the 1st quartile lies between the 2nd and 3rd lowest observations (i.e. 3 &4).
[DOC File]PROBABILITY TOPICS: PRACTICE
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Use the table in section 2.11.13 to calculate the following values: Exercise 8. Median = Exercise 9. Mode = Exercise 10. First quartile = Exercise 11. Second quartile = median = 50th percentile = Exercise 12. Third quartile. Exercise 13. Interquartile range (IQR) = _____ - _____ = _____ Exercise 14. 10th percentile = Exercise 15. 70th ...
[DOC File]Math 243 - Portland Community College
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To find the first quartile find the median of the lower half. (15 + 1)/2 = 8. The first quartile is in the 8th position. The third quartile can also be found by looking in the 8th position of the upper half.
[DOC File]PROBABILITY TOPICS: HOMEWORK
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Find the median, the first quartile, and the third quartile. Find the 65th percentile. Find the 10th percentile. Construct a box plot of the data. The middle 50% of the conferences last from _____ days to _____ days. Calculate the sample mean of days of engineering conferences. Calculate the sample standard deviation of days of engineering ...
[DOC File]Percentiles & Quartiles:
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The third quartile Q3 is the median of the upper half of the data; that is, it is the median of the data falling above Q2 (and not including Q2). To help you find the median easily use the median rank for n pieces of data, Median Rank = _n + 1_ 2 If the rank is a whole number, the median is the value in that position.
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