# Basic Statistics. Scales of measurement Nominal The one that has names Ordinal Rank ordered Interval Equal differences in the scores Ratio Has a true.

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Basic Statistics

Scales of measurement Nominal The one that has names Ordinal Rank ordered Interval Equal differences in the scores Ratio Has a true 0

Measures of Central Tendency Mode The most frequent number The bump in the graph

Measures of Central Tendency Median The one in the middle Is a number in the array except in case of ties

Measures of Central Tendency Mean Arithmetic average The total of the numbers divided by the number of cases

Frequency Distribution A method of examining a group of scores Ted100Amy80 Carmen85Carol85 Ralph75Tony85 Juanna98Martin100 Celeste98 Mo100 Joaquinne95

Tally Score 7511 8011 851113 9511 98112 1001113

Variance How are the score spread out Tells more than the mean of the group

Variance How are the scores spread out? In other words, how far do the scores range from the mean? Scores: 10, 12, 13, 10, 9, 2, 13, 12, 12, 10

Measures of Central tendency 10 12 13 10 9 2 13 12 10 Sum = 103 Mean= 10.3 Median= 11 Mode = 10 and 12

Variance 10 12 13 10 2 9 13 12 10 -0.3 1.7 2.7 -0.3 -8.3 -1.3 2.7 1.7 -0.3.09 2.89 7.29.09 68.89 1.69 7.29 2.89.09 sum of squares = 94.1 91.4/10 = 9.14 Square root of variance = 3.02

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