Статистическая викторина Британского медицинского журнала

[Наталья П.]

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Sampling distributions


Researchers obtained birth weights for 4300 men born between 1973 and 1975. The mean birth weight was 3471 grams and the standard deviation was 540 grams. The 95% confidence interval for the mean was 3455 grams to 3487 grams.

Which of the following statements best describes the information given by the 95% confidence interval?


a) 95% of men in the sample had a birth weight between 3455 and 3487 grams

b) There was a probability of 0.95 that the sample mean birth weight would fall between 3455 to 3487 grams

c) There is a probability of 0.95 that the 95% confidence interval will contain the population mean birth weight for men born between 1973 and 1975

d) 95% of men in the population born between 1973 and 1975 had a birth weight between 3455 and 3487 grams