Question: I need guidance on how to calculate this problem using excel. I used a pivot table to gather information, which I will paste below. But

I need guidance on how to calculate this problem using excel. I used a pivot table to gather information, which I will paste below. But need to find the correct formula to answer this question. Thanks!

Count of Response Total

Maybe 150

No 165

Yes 185

Grand Total 500

A large marketing firm is interested in the demand for a new brand of toothpaste. It conducted a survey of 500 adults. The results of the survey are provided in Sheet1 of Ch8HWData.xls file posted (Round to four decimal placesas needed.)

Q. The95% confidence interval for the true proportion of adults who would buy the toothpasteis:

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