ormation that you are given, what was the sample standard deviation of the number of hours that the high schoolers in the sample spent on their phones? 2. Another study conducted on 55 randomly sampled HS students in Seattle found that these students spent an average of 4.41 hours/day on their phones with a sample standard deviation of 1.83. What is a 95% confidence interval on the average number of hours/day spent by HS students in Seattle?
A random sample of 81 high-school students in Los Angeles was asked to put a phone activity tracker on their smartphones for one day. These students were found, on average, to spend 4.21 hours/day on their phones. Based on the data, the researchers said they were 95% confident that the average number of hours that high-school students in Los Angeles spend on their phones in one day is (3.67, 4.75).
1. Considering the information that you are given, what was the sample standard deviation of the number of hours that the high schoolers in the sample spent on their phones?
2. Another study conducted on 55 randomly sampled HS students in Seattle found that these students spent an average of 4.41 hours/day on their phones with a sample standard deviation of 1.83. What is a 95% confidence interval on the average number of hours/day spent by HS students in Seattle?
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