Hi,

In a survey of 9000 women, 6431 sy they change their nail polish once a week.

 Construct a 90% confidence interval for the population proportion of women who change their nail polish once a week.

 p = 6431/9000 = .715   and q = .285

ME = 1.645

X  = 6431

  6431 - ME <  < 6431 + ME 

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