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11 - The actual reduction in heart attack occurrence went...

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1/21/11 Descriptive Statistics Ex: Range, Outliers, Percentiles, Poor Questions Most Common o Mean o Median o Mode Measure of Central Tendency- What are some general properties of this sample of data o Ex: not the tallest, or the shortest, but the most central height of the population Descriptive vs. Inferential Inferential- used to make inferences from your sample of data to the population as a whole Also used to infer whether the probability of differences between groups is reliable o Ex: A&M students have an average IQ of 115; TU students’ average score is 111 The averages are descriptive The question of whether that difference is reliable involves inferential statistics Difference of 4 points may be significant but not meaningful Aspirin Case o Aspirin has been shown to reduce heart attacks in cardiovascular patients by one fifth A significant effect As a result many physicians recommend it But what do the actual numbers – the descriptive statistics tell us?
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Unformatted text preview: The actual reduction in heart attack occurrence went from 8.2% to 6.7% Is this meaningful? o IN people without cardiovascular disease aspirin reduces the chance of heart attack by one tenth Down from .57% to .51% • This effect may be significant but the descriptive statistics gives a richer understanding of the meaningfulness. The Balance of Inferential and Descriptive Stats • There is a need to consider both in order to determine how meaningful things really are “The Effects of Positive Affect (from receiving candy)” Article You will use both in your scientific reports • Descriptive- Describe your data- usually central tendencies • Inferential- Used to infer findings from your sample to the population o Whether or not your findings are reliable • Next class- go into more details about descriptive statistics o Finish reading chapter 2 move on to chapter 3 if you want to get ahead...
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