CHYS 3P15 Lecture Notes - Statistical Population, Level Of Measurement, Bar Chart

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3p15, jan 22, the normal curve (5) and measures of central tendency and dispersion (6) Three measures of central tendency: mode: the most common score, median: the middle score, mean: the average score. The mode: the most common or frequent score, not an arithmetic measure, can be used with variables at all levels of measurement, most often used with nominal level variables. How to find the mode graphically: the biggest slice of the pie is the mode. Sometimes it will be obvious, but sometimes it is easier to look at the frequency chart. : 1, 1, 1, 1, 3, 17, 19, 21, 23: sometimes it is. Finding the median (for interval/ratio data: arrange the cases from high to low (or low to high). Locate the middle case: if n is odd, the median is the value for the middle case, if n is even, the median is the average of the scores of the two middle cases.

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