Suppose that pregnancy duration in days for women follows a normal (bell-curve) distribution with a mean of 268 and a standard deviation of 15. a.) Sketch the distribution, clearly showing one, two, and three standard deviations from the mean.   For (b) – (d) below, you must draw a picture.   b.) What percentage of pregnancies last less than 268 days? __________   c.) What percentage of pregnancies last greater than 298 days?        __________   d.) What is the z-score for a pregnancy lasting 290 days?  Use 2 decimal places.    __________   e.) Interpret the z-score in (d) specifically in the context of this problem.

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Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.