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In 2017 91.5% of children aged 19-35 months were vaccinated for Measels, Mumps and Rubella (MMR). A sample of children taken in 2021 shows that

In 2017 91.5% of children aged 19-35 months were vaccinated for Measels, Mumps and Rubella (MMR).

A sample of children taken in 2021 shows that 500 out of 538 children were vaccinated for MMR.

Is the rate of MMR vaccination higher in 2021 than in 2017 at a ten percent level of significance?

Calculate a 95% confidence interval on the prevalence of MMR vaccination in 2021.

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