Question

The National Safe Driving Association has just hired you to conduct research on the prevalence of severe binge drinking among teens. You have created a scale ranging from 0 to 14 measuring the number of times teens drank 10 or more alcoholic beverages in a single sitting in the past 2 weeks. The average severe binge drinking score for your sample of 100 teens is 1.27, with a standard deviation of 0.80.

As sample size increases, how does the width of the confidence interval change (Width = Upper Limit – Lower Limit)? Explain how the sample size influences the standard error, margin of error, and precision of confidence interval?

Answer 1