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The International Nanny Association (INA) reports that in a sample of 928 in- home child care...

The International Nanny Association (INA) reports that in a sample of 928 in- home child care providers (nannies), 128 have passed the INA Nanny Credential Exam (2014 International Nanny Association Salary and Benefits Survey).

a. Use Wilson’s adjustment to find a 95% confidence interval for the true proportion of all nannies who have passed the INA certification exam.

b. We want to decide whether the proportion of who passed the INA certification exam exceeds than .12

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