Sampling and Condence Intervals 1. What is sampling error, why is there sampling error, when are we concerned about sampling error, and how do we measure sampling error? 2. How is the size of the standard error of the mean related to the size of the population standard deviation? How is the size of the standard error of the mean related to sample size? 3. What is the meaning of a 95% condence interval? 4. Dr. Graham collects information on text messaging from a random sample of 50 adults ages 25 to 44. Dr. Graham finds that these individuals send or receive an average of 68 text messages per day. Using a standard deviation, o, of 34, calculate the 95% confidence interval for the average number of texts sent by adults in this age group and write it in APA-style