BUEC 232 Lecture Notes - Lecture 3: Dependent And Independent Variables, Standard Deviation, Scatter Plot

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: then the answer is either 0 or. Unstandardizing the distribution: working backwards: start by the area end with finding z value. To transform z to x, use x = u + z(sigma) << un-standardization formula: example: u = 533, sigma = 115. P ( x >e 750) = p (z >e 750 u / (sigma)). Relationships: variables may be related to the outcome of an observation, for example, when the number of hours spent on promoting a product increases, the number of sales seem to increase. Or, when the number of cigarettes smoked increases, cancer rate also increases. Image: scatterplot of the number of items sold and gross sales, the x marks are. And how strong is this pattern: outliers: points that seem to lie outside these patterns, in the scatterplot above, it has a positive direction and it appears to be linear, with a few outliers on saturdays.

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