0:00
Ok.
00:01
So i see that you need help with this question.
00:02
And it says, a manufacturer of a smartphone is interested in designing a new phone around the way a typical customer would use it.
00:09
One of the most important characteristics for any smartphone is the battery life, since every activity on the smartphone draws power from the battery in some way.
00:18
This is especially true for those who use their phones heavily for texting, social media, gaming, et cetera.
00:26
In a market research survey, the manufacturer asked a random sample of 25 smartphone owners who consider themselves heavy users to run an app on their phone that would record the time the phone is used for various activities, but for privacy reasons, not record what the activity was.
00:48
The company decides to first examine the total minutes used in all activities.
00:53
The sample mean number of minutes of total use for the 25 users was 113 .5, the standard deviation of 28 .3 minutes.
01:07
Find the upper bound of a 90 % confidence interval for the true mean total of time that the smartphones were used by the population of heavy users.
01:17
Round to one decimal place...