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**downthesun01** *Ten engineering schools in the US were surveyed. The sample contained 250 electrical engineers, 80 being women, and 175 chemical engineers, 40 being women. Compute a 90% confidence interval for the difference between the porportion of women in these two fields of engineering.*** Is there a significant difference between the two proportions?**

I calculated the confidence interval and got:

$\displaystyle 0.091+/-0.043$

I'm a bit stuck on answering the bolded part though.

I would say that there is a significant difference between the two proportions because the 90% confidence interval doesn't include 0.

Is this correct? Thanks