Close Confidants and Social Networking Sites A study 1 has been conducted in which 2006 randomly selected US adults (age 18 or older) were asked to give the number of people in the last six months...

Close Confidants and Social Networking Sites



A study¹ has been conducted in which 2006 randomly selected US adults (age 18 or older) were asked to give the number of people in the last six months ‘‘with whom you discussed matters that are important to you.” The average number of close confidants for the full sample was 2.2. In addition, the study asked participants whether or not they had a profile on a social networking site. For the 947 participants using a social networking site, the average number of close confidants was 2.5 with a standard deviation of 1.4, and for the other 1059 participants who do not use a social networking site, the average was 1.9 with a standard deviation of 1.3.


Find a 95% confidence interval for the difference in means between the two groups μS-μN, where μS represents the mean number of close confidants for those using a social networking site and μN represents the mean number for those not using a social networking site.


Round your answers to two decimal places.


The 95% confidence interval is ___? to ___?