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  2. A/B testing - Wikipedia

    en.wikipedia.org/wiki/A/B_testing

    The company then monitors which campaign has the higher success rate by analyzing the use of the promotional codes. The email using the code A1 has a 5% response rate (50 of the 1,000 people emailed used the code to buy a product), and the email using the code B1 has a 3% response rate (30 of the recipients used the code to buy a product). The ...

  3. Coupon collector's problem - Wikipedia

    en.wikipedia.org/wiki/Coupon_collector's_problem

    Download QR code; Print/export Download as PDF; Printable version; ... the coupon collector's problem refers to mathematical analysis of "collect all coupons and win ...

  4. North America - Wikipedia

    en.wikipedia.org/wiki/North_America

    A map of North America's physical, political, and population characteristics as of 2018. North America is a continent [b] in the Northern and Western Hemispheres. [c] North America is bordered to the north by the Arctic Ocean, to the east by the Atlantic Ocean, to the southeast by South America and the Caribbean Sea, and to the west and south by the Pacific Ocean.

  5. Natural number - Wikipedia

    en.wikipedia.org/wiki/Natural_number

    Mathematicians have noted tendencies in which definition is used, such as algebra texts including 0, [22] [d] number theory and analysis texts excluding 0, [22] [29] [30] logic and set theory texts including 0, [31] [32] [33] dictionaries excluding 0, [22] [34] school books (through high-school level) excluding 0, and upper-division college ...

  6. GameStop - Wikipedia

    en.wikipedia.org/wiki/GameStop

    Sherman and the board of directors took a 50% pay cut while other executives took a 30% cut to offset losses. [144] While digital sales grew by 519%, its retail dropped by more than 30% in the same period from the prior year, and the chain reported a US$165 million loss in contrast to a US$6.8 million for the same quarter in 2019.

  7. N,N-Diisopropylethylamine - Wikipedia

    en.wikipedia.org/wiki/N,N-Diisopropylethylamine

    DIPEA is a sterically hindered organic base that is commonly employed as a proton scavenger. Thus, like 2,2,6,6-tetramethylpiperidine and triethylamine, DIPEA is a good base but a poor nucleophile, DIPEA has low solubility in water, which makes it very easily recovered in commercial processes, a combination of properties that makes it a useful organic reagent.

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