STAT-2126EL Lecture Notes - Lecture 2: Statistic, Descriptive Statistics, Statistical Parameter
10 Sep 2018
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Variable: a characteristic or condition that can be measured or manipulated. Population or a sample (different equations for samples and populations) We use samples to make inferences on the whole population and hope for the same effect. Need to use bigger samples to verify the accuracy of the data. Parameters: descriptions about the population, typically in the form of a number. Sample size of 10 and average height produced would be a statistic. Ex: how accurate does my sample of 20 reflect the whole population of. It is always important to pick a population of interest. Pick something about a population that we are interested in observing/ measuring/ collecting data about. A population doesn"t have to be people: can be cars, animals, trees, anything. Need to watch out for biases, this will lead to unrepresentative samples. Ex: doing a study on food and having a vegetarian participate would create the outliers.
