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Answer to Question #2406 in Statistics and Probability for Damien

Question #2406
In 1983, a random sample of 1000 scientists included 212 female scientists. A similar
random sample of scientists in 1990 included 272 women. Do these figures indicate
an increase in the population proportion of scientists who are women?

Hint: Construct the 95% CI for the diff erence in proportions and examine whther
that CI contains zero.
Expert's answer
Answer is yes, because 95% one-tailed confidence interval is (0, r),

where r = 212/1000 + Z0.95 * √(212*(1000-212)/10003) = 0.233,
and the new proportion is more than right bound :

272/1000 = 0.272 > 0.233
And we reject hypothesis about that proportion is equal or less than 0.212.

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