Find q3 and q1

    • STATISTICS: Sect

      (3) To find Q1 (first quartile): Find the median of ALL values that are below the median. (4) To find Q3 (third quartile): Find the median of ALL values that are above the median. Note: NEVER include the actual median in the data when finding the quartiles. Find the 5-number summary and draw the boxplot for each data set. 1.

    • [DOC File]CHAPTER 14: DESCRIPTIVE STATISTICS

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      IQR = Q3 - Q1. Represents the spread of the MIDDLE 50% of the data values. OUTLIERS: an extreme data point that does not fit into the overall pattern. CALCULATING AN OUTLIER: Use the IQR. Value > Q3 + 1.5 IQR or Value < Q1 - 1.5 IQR. Use information from the five number summary to calculate.

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      Jeffrey surveys the 10 girls and 10 boys in his class to find out how many shoes they have in their closets. Write a statement about Q1,Q3, Median, and the Mean. Boys: Girls: ̅ x = 9.6 . ̅ x = 13 Q1 = 7 Q1= 10 median = 9 median= 12.5 Q3 = 12 Q3= 16The mean number of shoes is higher for girls than for boys. The Q1 and Q3 for girls . is

    • [DOC File]3 - Faculty Websites

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      Find the five number summary: minimum, Q1, median, Q3, and maximum. Locate the values for Q1, the median and Q3 on the scale. These values determine the “box” part of the boxplot. The quartiles determine the ends of the box, and a line is drawn inside the box to mark the value of the median. Find the IQR = Q3 – Q1.

    • [DOC File]Chapter Three - Miami Dade College

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      The interquartile range (IQR) is given by Q3 –Q1, where Q1 and Q3 are the first and third quartiles, respectively. Examples 3–20 and 3–21 of the text show how to find the IQR for a data set. Given a data set of n values, to find the kth percentile (Pk): 1. Rank the given data in increasing order. 2. Calculate kn/ 100.

    • [DOC File]Study Guide - Michigan State University

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      Calculate the median M, lower and upper quartiles, Q1 and Q3, and the interquartile range, IQR= Q3 – Q1, for the data set. Construct a box with Q1 and Q3 located at the lower corners. The base width will then be equal to IQR. Draw a vertical line inside the box to locate the median M.

    • [DOC File]1

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      The first quartile Q1 is the 25th percentile, 25 percent of the observations in a list are smaller than Q1. The second quartile, Q2 is the 50th percentile, or the median. About half the data are less than this value Q2. The third quartile, Q3 is the 75th percentile, about 75 percent of the observations are below this value Q3.

    • [DOC File]Describing Data

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      Minimum, Q1, Median, Q3, Maximum. To find the first quartile, we need to find the data value so that 25% of the data is below it. If n is the number of data values, we compute a locator by finding 25% of n. If this locator is a decimal value, we round up, and find the data value in that position.

    • [DOC File]JMP TUTORIAL #1 - DESCRIPTIVE METHODS FOR CATEGORICAL AND ...

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      Q1 = 25th percentile or quantile. Q2 = 50th percentile or quantile = MEDIAN. Q3 = 75th percentile or quantile. Interquartile Range (IQR) (another measure of spread) IQR = Q3 – Q1 and gives the range of the middle 50% of our observed values. Standardized Variables (z-scores) The z-score for an observation is (sample) or (population).

    • [DOC File]Unit 1 Chapter 2 Summary

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      Find Q1. This is the median of the data from the 10th and below. Q1 = Find Q3. This is the median of the data of the upper half of the data. Q3 = Now the five-number summary can be given. Lowest value 2 Q2 = 9.5 Median or Q2 = 23 Q3 = 28.5 Highest value 42. Interquartile Range IQR = Q3 – Q1

    • [DOC File]MATHEMATIC WORKSHEET FOR X Grade

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      Q3 = Q1 = X95 = Exercise 7. In an agricultural experiment, the lengths of 124 ears of barley were measured. The data obtained is expressed in the following table: Length (mm) Number of ears of barley 1 8 35 50 25 5 Construct a cumulative frequency table, using the classes “20 or less”, “30 or less”, and so on

    • [DOC File]MEASURES OF CENTRAL TENDENCY

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      Find Q1, Q2, and Q3 from the following. Marks below 10 20 30 40 50 60 70 80 No. of students 15 35 60 84 96 127 198 250 Ans Q1 = 31.04 Q2 = 28.33 Q3 = 37.78. MODE. Arithmetic mean sometimes becomes unworthy due to the influence of extreme scores in the distribution. For example, in the series 2,2,3,4,10,12,20 and 45, the extreme scores detract ...

    • [DOC File]Geo C

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      Find the IQR value of 80 by subtracting the Q3 and Q1 values. Multiply this IQR by 1.5 . to find the value to be added to Q3 and subtracted from Q1 to find the “fences” for the Outlier Rule. The low fence falls at -90…30 – 120, and the high fence falls at 230…110 + 120. No prices in the survey fall beyond these fence values.

    • [DOC File]A statistic is a characteristic or measure obtained by ...

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      Find the five number summary: minimum, Q1, median, Q3, and maximum. Locate the values for Q1, the median and Q3 on the scale. These values determine the “box” part of the boxplot. The quartiles determine the ends of the box, and a line is drawn inside the box to mark the value of the median. Find the IQR = Q3 – Q1.

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