Stat

TEST 1 NOTES CHAPTER 1: INTRODUCTION 1.1 What is Statistics? Statistics The science of design studies and analyzing the information that those studies produce. Statistics is the science of learning from data. For example, we may deficiency to know... (1)The fair pattern of movies lot watch in one calendar month (2)The somewhat common color of a car (3)The proportion of people who own a dog But of course, we cannot peradventure examine everybody in the whole existence. This is too time-consuming and costly. So, this is where statistics comes in. Statistics involves analyze but a handful of people, randomly selected from the population, and then utilize the results in that try to make a conclusion about the population. Incidentally, the expression statistics was first coined in 1834 in Thurso, Scotland by Sir tin can Sinclair. 1 of 54 1.2 We Learn about cosmoss using Samples For the next definitions, keep in mind as an example predicting the effect of an election. Definition Population The total set of subjects in which we ar interested. Ex. = The entire choose public Sample A subset of the population for whom we have data. Ex. = cc randomly selected voters Subject entities that we measure in a study. Ex. = individually voter in the sample controversy A numeral lever summarizing the population data. Ex.

= percentage of voters voting for vista A in the entire population Statistic A numerical value summarizing the sample data. Ex. = percentage of voters voting for candidate A in our sample (the 200 randomly selected voters) hither is a Venn plot illustrating the concepts. 2 of 54 Of course, there argon many possible d isparate samples that can be draw from the ! population, so two divers(prenominal) researchers doing the same study will most certainly tack two different groups of people. That means that sample averages will differ, depending on which subjects argon chosen. Example There are 1300 students taking STAT 2000, and wed like to know the proportion of these...If you want to get a full essay, order it on our website: OrderEssay.net

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