Health issues due to being overweight affect all age groups

Health issues due to being overweight affect all age groups. Of children 6

Solution

The test hypothesis:

Ho: p=0.188 (i.e. null hypothesis)

Ha: p<0.188 (i.e. alternative hypothesis)

The test statistic is

Z=(phat-p)/sqrt(p*(1-p)/n)

=(14/126-0.188)/sqrt(0.188*(1-0.188)/126)

=-2.21

It is a left-tailed test.

Given a=0.05, the critical value is Z(0.05) = -1.645 (from standard normal table)

The rejection region is if Z<-1.645, we reject the null hypothesis.

Since Z=-2.21 is less than -1.645, we reject the null hypothesis.

So we can conclude that this is less than the national proportion