Obtain the 95% confidence interval for the proportion of all employers who would rank stress as their top health and productivity concern from the given output and interpret it.

Question

Results from the National Health and Nutrition Examination Survey (NHANES) conducted thirty years ago revealed that out of 378 randomly selected adults in the United States 57 were considered to be obese. In this year’s National Health and Nutrition Examination Survey, out of 426randomly selected adults in the United States 135 were considered to be obese. Based on these results, can one conclude, at the 0.01 level of significance, that the percentage of adults in the United States that are obese is considerably higher now than it was thirty years ago?

Answer 1

Question

Chapter 9.5, Problem 62E

a.

To determine

Obtain the 95% confidence interval for the proportion of all employers who would rank stress as their top health and productivity concern from the given output and interpret it.

b.

To determine

Explain whether the width of the confidence interval remains the same, increases, or decreases if the results from international employers were also included in the sample.

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