# Thread: i am having trouble with a stats question

1. ## i am having trouble with a stats question

What do you think is the most common nonobstetric (not related to pregnancy) reason for hospitalization among 18-44 American women? According to the U.S. Agency for Healthcare Research and Quality (www.ahrq.gov), this is the category of affective disorders such as depression. In 2002, 7% of hospitalizations among 18-44 year old American women were for affective disorders. Suppose that a random sample taken this year of 1000 hospitalizations of 18-44 year old women showed 80 admitted for affective disorders. We are interested in whether the population proportion of hospitalizations for affective disorders has changed since 2002. Test using the p-vale method and level of significance α = 0.10

2. ## Re: i am having trouble with a stats question

Originally Posted by Britneymill55
What do you think is the most common nonobstetric (not related to pregnancy) reason for hospitalization among 18-44 American women? According to the U.S. Agency for Healthcare Research and Quality (www.ahrq.gov), this is the category of affective disorders such as depression. In 2002, 7% of hospitalizations among 18-44 year old American women were for affective disorders. Suppose that a random sample taken this year of 1000 hospitalizations of 18-44 year old women showed 80 admitted for affective disorders. We are interested in whether the population proportion of hospitalizations for affective disorders has changed since 2002. Test using the p-vale method and level of significance α = 0.10
So in 2002, there was a 7% chance of being admitted to the hospital for an affective disorder. This year, we took a sample and 8% of people hospitalised in our sample had affective disorders (what is the probability this happened out of chance given there is still a 7% chance of this happening). Use a binomial calculator (google this) to find the probability of achieving at least 80/1000 successes when the probability of success is only 7%. If the probability is less than 10%, there is statistically significant evidence of a change (at the 10% level).

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