Stacy recorded the number of minutes she used her smartphone each day for one week before using an app that awards points for decreased phone usage, and for one week after using the app. Stacy's
alternative hypothesis is He: x < 114.6.
Before 103 127 87 124 95 136 130
After 83 94 120 105 75 98 96
What is the difference in the sample means? Round to the nearest tenth of a minute.
difference in sample means =
minutes