1 / 11

Basic Statistics

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

uta
Télécharger la présentation

Basic Statistics

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Basic Statistics

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

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

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

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

  6. Frequency Distribution • A method of examining a group of scores • Ted 100 Amy 80 • Carmen 85 Carol 85 • Ralph 75 Tony 85 • Juanna 98 Martin 100 • Celeste 98 • Mo 100 • Joaquinne 95

  7. Tally • Score • 75 1 1 • 80 1 1 • 85 111 3 • 95 1 1 • 98 11 2 • 100 111 3

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

  9. 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

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

  11. Variance 10 12 13 10 2 9 13 12 12 10 -0.3 1.7 2.7 -0.3 -8.3 -1.3 2.7 1.7 1.7 -0.3 .09 2.89 7.29 .09 68.89 1.69 7.29 2.89 2.89 .09 sum of squares = 94.1 91.4/10 = 9.14 Square root of variance = 3.02

More Related