# lecture 4 - Example in computing percentiles by hand(use...

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Example in computing percentiles by hand! (use sample of 20) Statistics can be generalized (to some degree) to be the following: Step 1: Collect Sample(s). Step 2: Based on the Sample(s), come up with the probability of whatever you’re interested in regarding the population. If Minitab is a tool of Statistics, Probability theory is the backbone! Everything in Statistics stems from Probability. (Even the pictures we saw (Bar Chart, Pie Chart, Histogram) are heavily tied to probability because we can (and want) to ask “What is the probability of seeing the observed Sample (and subsequent picture)?” A statistician usually wants to make inferences regarding certain population measures (of centrality, of variability). To make this inference, the statistician asks “What is the probability of observing the given sample if the population quantity is (say big/small)?” A statistician may want to assess the chances of a failure of a product by looking at a sample of the product.

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