In: Statistics and Probability
Many people find that they spend a lot of time on their smartphones each day without realizing how long they are scrolling through apps or playing games. A researcher wanted to test whether a mindfulness intervention would help people be more aware of how much time they spend on their phones, and if this might lead to decreased time spent on their phones each day. To perform this study, participants used an app that tracks phone usage in minutes the week before the mindfulness intervention, and the week after the intervention. Hypothetical data (in minutes) are provided in the table
before | after |
160 | 153 |
125 | 124 |
142 | 136 |
187 | 167 |
1.) What are the populations in this study?
2.) What is the mean of the Distribution of Means of Difference Scores?
3.) Calculate the t-statistic at a p level of 0.05 and identify the critical t-values
4.) What is the 95 percent Confidence Interval?
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