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:
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
What I want you to see is that the confidence interval is:
In other words I want you to calculate the confidence interval correctly.