00:01
Okay, so i see that you need help with this question.
00:02
It says, in a random sample of 48 students at a large university reported given an average of seven hours of sleep on weeknights in a standard deviation of 1 .62 hours, a dot plot of the data is provided.
00:21
Use formulas to construct a 95 % confidence interval for the average amount of weeknight sleep for students at this university.
00:30
Round to three decimal places, show all of your work.
00:33
Okay, so the first thing that we need to do is we need to calculate the t score.
00:39
So you have to take 1 minus 0 .95, and that's 0 .05.
00:44
Then 1 minus 0 .05, divide that by 2, and that equals 0 .975.
00:53
And then what you're going to do is you're going to take t, 0 .975, using the chart with a degree of freedom of 47, and you're going to get a 2 .01 t score.
01:09
So then what you're going to do is you are going to take your mean of seven...