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Question

The lengths of pregnancies in a small rural village are normally distributed with a mean of 269 days and a standard deviation of 17 days. In what range would you expect to find the middle 95% of most pregnancies? Between and . If you were to draw samples of size 39 from this population, in what range would you expect to find the middle 95% of most averages for the lengths of pregnancies in the sample? Between and . Enter your answers as numbers. Your answers should be accurate to 1 decimal places.

Answer 1

mean +/- t(sd)/sqrN

= 269+/-2.021(17)/sqr39

=about 263.5 to 274.5