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Percent Obese by State

Computer output giving descriptive statistics for the percent of the population that is obese for each of the US states, from the USStates dataset, is given in Figure 1 shown below. Since all US states are included, this is a population, not a sample. Descriptive Statistics: Obese Variable Mean SE Mean StDev Minimum Median Maximum Obese
Figure 1 Percent of the population that is obese by state

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Explanation / Answer

a. From table we can find that mean=24.552 and sd=3.044

b. z score for 30.900, so z=30.900-24.552/3.044=2.09

and z score for 17.800 is z=17.800-24.552/3.044=-2.22

c. z=1.96 for 95% CI

So Margin of Error = E=z*sd/sqrt(n)=0.844

Hence CI=mean+/-E=24.552+/-0.844=(23.708,25.396)

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