Sampling distributionsBMJ 2009; 338 doi: https://doi.org/10.1136/bmj.b2290 (Published 10 June 2009) Cite this as: BMJ 2009;338:b2290
- Philip Sedgwick, senior lecturer in medical statistics1
- 1Centre for Medical and Healthcare Education, St George’s, University of London, London SW17 0RE
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 …