A phone company is trying to answer the following question:
"Do teenagers spend more time on their phones then people who are older than 40?"
The company randomly samples 50 teenagers and 50 adults over 40 on how much time they spend on their
phone, in minutes per day. The results are the following.
Teenager Group:
mean = 194 minutes
std. dev. = 48 minutes
Over 40 Group:
mean = 165 minutes
std. dev. = 55 minutes
(a) Give intervals for both groups that represents the typical data values found in the samples.
(b) The intervals from (a) overlap. What does this tell you about data values in the two groups?