logging in or signing up Week 3 Descriptive stats physioactive Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINTLite Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: (To copy code, click on the text box) Embed: URL: Thumbnail: WordPress Embed Customize Embed The presentation is successfully added In Your Favorites. Views: 1563 Category: Education License: All Rights Reserved Like it (4) Dislike it (0) Added: February 01, 2008 This Presentation is Public Favorites: 0 Presentation Description Lecturer: Chee- Wee Tan Module: P1112 Introduction to Research University: Queen Margaret University, Edinburgh Comments Posting comment... Premium member Presentation Transcript Descriptive Statistics: Descriptive Statistics Chee-Wee Tan Module P1112What are descriptive statistics?: What are descriptive statistics? Summarising data Spotting patterns 6186458166186458164563816458163456184658164516465Case Study: Case Study Drink kryptonite -- More push-ups? 1 6 1 2 6 1 2 2 10 3 4 9 4 5 7 5 6 6 6 2 6 6 9 7 7 8 8 9 9 3 3 10 2 1 10 2 10 10 10 6 6 6 9 Histogram: HistogramDistributions: Distributions Normal DistributionSkewed Distributions: Skewed Distributions Positively skewed Negatively skewedKurtosis: Kurtosis Leptokurtic distribution platykurtic distributionMeasures of Central Tendencies: Measures of Central Tendencies Mode Used with nominal data Bimodality may be messy to deal with.Measures of Central Tendency: Measures of Central Tendency Median 1 1 1 1 2 2 2 2 2 2 3 3 3 4 4 5 5 6 6 6 6 6 6 6 6 6 6 7 7 7 8 8 9 9 9 9 9 10 10 10 10 10 10Measures of Central Tendency: Measures of Central Tendency Mean Can be used in interval and ratio dataMeasures of Dispersion: Measures of Dispersion Range 60%Measures of Dispersion: Measures of Dispersion How much cleverer am I? Squaring deviations: Squaring deviations 42 = 16 (- 4)2 = 16 Add up all (deviations)2 Number of scores we have (N) = Variance (N-1) used to divide instead of N Field A. (2003) How to Design & Report Experiments’, Sage Publications, London, p129.Standard Deviation: Standard Deviation Push-up squared? Square-root of variance = standard deviation Presenting our statistics: Presenting our statistics The mean number of push-ups for kryptonite drinkers is 5.7 push-ups (S.D. = 3.01) Or, Non-kryptonite drinkers did less number of push-ups (M = 2.0, S.D. = 2.7) than kryptonite drinkers (M = 5.7, S.D. = 3.01).Presenting our statistics: Presenting our statistics Or we could portray this information using a graph, something like this…Summary: Summary Distributions Measures of central tendency Measures of dispersion Using graphs Remember to read the directed reading! You do not have the permission to view this presentation. In order to view it, please contact the author of the presentation.
Week 3 Descriptive stats physioactive Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINTLite Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: (To copy code, click on the text box) Embed: URL: Thumbnail: WordPress Embed Customize Embed The presentation is successfully added In Your Favorites. Views: 1563 Category: Education License: All Rights Reserved Like it (4) Dislike it (0) Added: February 01, 2008 This Presentation is Public Favorites: 0 Presentation Description Lecturer: Chee- Wee Tan Module: P1112 Introduction to Research University: Queen Margaret University, Edinburgh Comments Posting comment... Premium member Presentation Transcript Descriptive Statistics: Descriptive Statistics Chee-Wee Tan Module P1112What are descriptive statistics?: What are descriptive statistics? Summarising data Spotting patterns 6186458166186458164563816458163456184658164516465Case Study: Case Study Drink kryptonite -- More push-ups? 1 6 1 2 6 1 2 2 10 3 4 9 4 5 7 5 6 6 6 2 6 6 9 7 7 8 8 9 9 3 3 10 2 1 10 2 10 10 10 6 6 6 9 Histogram: HistogramDistributions: Distributions Normal DistributionSkewed Distributions: Skewed Distributions Positively skewed Negatively skewedKurtosis: Kurtosis Leptokurtic distribution platykurtic distributionMeasures of Central Tendencies: Measures of Central Tendencies Mode Used with nominal data Bimodality may be messy to deal with.Measures of Central Tendency: Measures of Central Tendency Median 1 1 1 1 2 2 2 2 2 2 3 3 3 4 4 5 5 6 6 6 6 6 6 6 6 6 6 7 7 7 8 8 9 9 9 9 9 10 10 10 10 10 10Measures of Central Tendency: Measures of Central Tendency Mean Can be used in interval and ratio dataMeasures of Dispersion: Measures of Dispersion Range 60%Measures of Dispersion: Measures of Dispersion How much cleverer am I? Squaring deviations: Squaring deviations 42 = 16 (- 4)2 = 16 Add up all (deviations)2 Number of scores we have (N) = Variance (N-1) used to divide instead of N Field A. (2003) How to Design & Report Experiments’, Sage Publications, London, p129.Standard Deviation: Standard Deviation Push-up squared? Square-root of variance = standard deviation Presenting our statistics: Presenting our statistics The mean number of push-ups for kryptonite drinkers is 5.7 push-ups (S.D. = 3.01) Or, Non-kryptonite drinkers did less number of push-ups (M = 2.0, S.D. = 2.7) than kryptonite drinkers (M = 5.7, S.D. = 3.01).Presenting our statistics: Presenting our statistics Or we could portray this information using a graph, something like this…Summary: Summary Distributions Measures of central tendency Measures of dispersion Using graphs Remember to read the directed reading!