Read the following paragraph and answer the questions given at the end : A few years ago seven swallows were caught near their nests at Bremen in Germany. They were marked with a red dye on some of their white feathers, so that they could easily be seen. Then they were taken by aeroplane to Croydon, near London; this is a distance of 400 miles. The seven swallows were set free at Croydon. Five of them flew back to their nests at Bremen. How did the birds find their way on that long journey, which they had never made before? That is the great puzzle. It is no good saying thatthe swallows have a ‘sense of direction’, or an ‘instinct to go home’. These are just words, and explain nothing. We want to know exactly what senses the birds use to find their way, how they know in which direction to go until they can see familiar landmarks. Unfortunately practically no scientific experiments have yet been made on this question. Perhaps migrating birds are the greatest mystery of all. Swallows from England go as far as South Africa–a distance of 6,000 miles. And the birds not only return from Africa to England next spring, but often they come back to nest in the very same house where they nested the year before(i) Which of the groups of words given below would you select as a title? (a) Our Migratory Birds (b) The Great Puzzle (c) Swallows at Croydon 1 (ii) Summarize the passage in about 150 words.
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a hospital based cross-sectional study, it is planned to estimate the mean D-dimer level among COVID-19 patients. From previous literature, the standard deviation was found to be 200 ng/mL. If the researchers want to estimate the mean with a 50 ng/mL precision and 95% significance level, what is the minimum sample size required?
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