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10 Cards in this Set
- Front
- Back
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Descriptive Statistics |
Give overall idea for immediate information of the experiment's results: summary stats (mean, median, mode), graphs, charts. |
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Histogram |
Descriptive Stats: graph of number of times groups of values appear in a data set. The y-axis has frequency, x-axis has has variable. |
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Frequency Distribution |
Smooth curve that connects the peaks of each bar in the histogram (often following a normal distribution). |
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Mean, Median and Mode |
Mean: average value of data set, affected by outliers Median: middle value of data set, unaffected by outliers Mode: the value that appears most frequently in a data set, unaffected by outliers |
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Standard Deviation |
Measures the average distance each data point is from the mean. Larger standard deviation = more spread out data. |
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Inferential Statistics |
Allows us to make inferences about overall populations from a data set. |
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T-Test |
Inferential stat test used to compare differences between data from control and experimental groups. Calculates the probability that two samples were drawn from the same population. |
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P-Value |
Derived from the T-Test. If P < 0.05 gives 95% confidence a difference does exist between the samples. P < 0.05 = statistically significant, < 5% chance the data was found by chance. |
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Observational Studies |
No experiment or manipulation by an experimenter. Hypotheses and stats are used to analyze. |
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Correlation Coeffecient |
Relationship between two variables (r). The closer you get to one, the stronger the relationship between the two variables is. r = 1 = perfect positive correlation r = -1 = perfect negative correlation r = 0 = no correlation/relationship |
