A teacher looks at his students test to see which topics his students are still struggling with. What is this a Observational Study or Survey or Experiment?
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A survey is a method of gathering information from a sample of people, typically by asking them questions about their opinions, experiences, or behaviors. An experiment is a research method in which a researcher manipulates one or more variables, measures the Show more…
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5. A company produces cylindrical pop cans with internal base radius r = 5 cm and height h = 15 cm. They wish to reduce r by 0.1 cm. In order to keep the volume of pop the same, we find, using differentials, that h should change by: (a)0.6; (b)0.7; (c)0.8; (d)0.9; (e)1. Ans:(a) 6.Let f(x, y) = { x^2/(x^2 + y^2), (x, y) != (0, 0) c, (x, y) = (0, 0) for some constant c. For f to be continuous at (0, 0), c must equal (a)0; (b)1; (c)2; (d)3; (e) there is no such value of c. Ans:(e)
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