if the population: interpret these results. 4. By using the same mean and standard deviations as in problem 3, change the sample size to 25 and construct a confidence interval around the mean using the appropriate procedures. How does the interval change? Provide an interpretation for your interval.3. A hypothetical study concerned with estimating th187e amount of marijuana use per year among a teenage population obtained a sam- ple of 110 high-school students. With the following sample statistics, construct a 95% confidence interval around the mean number of times this sample uses marijuana in a given 6-month period: X = 4.5 times per year s= 3.2 n =110