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What are the two main branches of statistics?

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Descriptive statistics is the branch of statistics that involves the organization, summarization, and display of data. For example, descriptive statistics involves statements such as “For unmarried men, approximately 70% were alive at age 65” and “For married men, 90% were alive at 65.” Inferential statistics is the branch of statistics that involves using a sample to draw conclusions about a population. A basic tool in the study of inferential statistics is probability. For example, inferential statistics involves statements such as "being married is associated with a longer life for men".
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In each of the following cases, identify the type of distribution of the random variable X and find the corresponding parameter values. A bag of Skittles has 10 red, 11 orange, 11 yellow, 14 green, and purple candies. You draw seven candies at random from the bag. Let X be the number of yellow candies obtained. When a student goes bowling, she gets a strike in 1 out of 8 rounds on average. Let X be the total number of strikes that she achieves during two games of 10 rounds each. (For simplicity, we disregard any potential extra throws in the last round.) A wheel of fortune is divided into twelve equally sized sections numbered from 1 to 12. Let X be the outcome when spinning the wheel. Consider a similar wheel as above, but this time with only one straight line going from the center to the edge. Let X be the difference in angle between the directions of this line before and after spinning the wheel. A biathlete with an average hit rate of 78% per shot arrives at the firing range. Let X be the number of shots needed to hit all five targets. A service desk opens at exactly 8:30 am. Let X be the time (in minutes) until the first phone call is received. It is estimated that there is a 50% probability of the first phone call coming within 5 minutes. The scores on an IQ test are calibrated so that the average test score is 100 and only 4.78% of all persons get a score of 125 or more. Let X be the test score of a randomly selected person in the population. During weekday evenings, customers arrive at a drive-through restaurant at a steady average rate of 12 cars per hour. Let X be the number of cars arriving between 7:00 pm and 7:30 pm on Tuesday. A roulette wheel has 38 numbered slots (0, 00, and 1-36). A superstitious number theorist is playing roulette, and he always places a bet on all numbers that are both prime and "lucky" (but not on any others). The lucky number sequence goes: 1, 3, 7, 9, 13, 15, 21, 25, 31, 33, 37, 43, 49, 51, 63 (OEIS A000959). Let X be the number of roulette rounds needed to get a win.
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Question Text
What are the two main branches of statistics?
TopicAll Topics
SubjectStatistics
ClassClass 11
Answer TypeText solution:1