Test 1 Notes

# Test 1 Notes - -the height of the dot at each midpoint...

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Width = High – Low / # of classes Class Boundaries = Low value – 0.5; High value + 0.5 Relative Frequency = f/n = count (freq.) / total # Class Boundaries – Have one more place value than the data and end in a 5; the upper class boundary is the lower boundary of the next class. Cumulative Frequency – the sum of the frequencies for the current class and all previous classes - cf = f for class 1 - cf for later classes = cf of previous class + f of current class - cf = n for the last class Cumulative Relative Frequency – the sum of the cumulative frequencies for the current class and all previous classes - crf = cf/n Histogram : -horizontal scale uses class boundaries -vertical scale shows frequency or relative frequency -bars should touch -bell shaped, uniform (relatively the same), left skewed, right skewed, bimodal (2 peaks) Frequency Polygon: -horizontal scale uses class midpoints -vertical scale shows frequency or relative frequency

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Unformatted text preview: -the height of the dot at each midpoint represents the frequency of the class Ogive:-aka cumulative frequency graph-horizontal scale shows class boundaries-vertical axis shows cumulative frequency or cumulative relative frequency-height of each dot represents accumulated frequency at that point -shows the rate of change -ends in air Central Tendency: averages, mean, median, mode Variability: standard deviation, coefficient of variance Range = High – Low Position : deciles, quartiles Coefficient of Variation : Mean/Standard deviation x 100%; more variable = higher number Percentile = a measurement of position; what proportion of values are equal to or below a certain position Chebyshev’s Theorem : 1- (1/k2) Outlier : - An extremely high or low data value when compared to the rest; any score that falls outside the range from Q1 – 1.5IQR to Q3 + 1.5IQR - IQR = Q3 – Q1...
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Test 1 Notes - -the height of the dot at each midpoint...

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