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Coupon collector's problem. In probability theory, the coupon collector's problem refers to mathematical analysis of "collect all coupons and win" contests. It asks the following question: if each box of a given product (e.g., breakfast cereals) contains a coupon, and there are n different types of coupons, what is the probability that more ...
Down syndrome (United States) or Down's syndrome (United Kingdom and other English-speaking nations), also known as trisomy 21, is a genetic disorder caused by the presence of all or part of a third copy of chromosome 21. [ 3] It is usually associated with developmental delays, mild to moderate intellectual disability, and characteristic ...
A postman collecting mail for delivery. The mail or post is a system for physically transporting postcards, letters, and parcels. [ 1] A postal service can be private or public, though many governments place restrictions on private systems. Since the mid-19th century, national postal systems have generally been established as a government ...
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Statistical significance. In statistical hypothesis testing, [ 1][ 2] a result has statistical significance when a result at least as "extreme" would be very infrequent if the null hypothesis were true. [ 3] More precisely, a study's defined significance level, denoted by , is the probability of the study rejecting the null hypothesis, given ...
Pennsylvania ( / ˌpɛnsɪlˈveɪniə / ⓘ PEN-sil-VAY-nee-ə, lit.'Penn's forest country' ), officially the Commonwealth of Pennsylvania[ b ] ( Pennsylvania Dutch: Pennsylvanie ), [ 7 ] is a state spanning the Mid-Atlantic, Northeastern, Appalachian, and Great Lakes regions of the United States.
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