1. Introductory Statistics for Laboratorians dealing with High Throughput Data sets Centers for Disease Control

2. Shapes of Distributions

9. Uniform Distribution

10. Density curves come in any imaginable shape. Some are well-known mathematically and others aren’t.

11. Problem 6 Scores: 9, 8, 8, 7, 6, 5, 5, 5, 4, 3 How many scores are there? N = ________. Make a frequency distribution using the table provided. Make a bar chart of the data using the axes provided.

12. Problem 6 Frequency Distribution Scores X Frequency f N =

13. Problem 6 Frequency Distribution Scores X Frequency f 91 82 71 61 53 41 31 N =

14. Problem 6 Bar Chart

16. Problem 6 Central Tendency Which score is most frequent? Draw a line on the bar chart that splits the distribution in half (ie: half the scores are above the line, half are below the line). Calculate the average of the 10 scores. (Scores are repeated here: 9, 8, 8, 7, 6, 5, 5, 5, 4, 3 )

17. Definitions: Central Tendency There are three different statistics that are used to indicate the center/middle of the distribution. They are: Mode: the most frequent score (M o ) Median: the score that splits the distribution in half (half the scores above/ half below). (M d ) Mean: the arithmetic average. ( )

18. Central Tendency In a Symetrical Distribution

19. Skewness Negatively skewed distribution

20. Skewness Positively Skewed

21. Kurtosis

22. Examples