A markering research firm has put together the health survey that it would like to administer to individuals in malls across state. They need to estimate the mean time it takes to complete the survey so that recruiters can give potential participants an idea of their time commitments. The survey is administered to a random sample of 40 individuals. The mean time to complete the survey is 14.6 minutes with a standard deviation of 2.8 minutes. estimate the mean time to complete the survey using 95% confidence interval.