00:02
So let's break down this question step by step.
00:07
Number one, null and alternative hypothesis.
00:16
So the null hypothesis is that sleep deprivation has no significant effect on the ability to maintain sustained attention.
00:25
The alternative hypothesis is that sleep deprivation significantly affects the ability to maintain sustained attention.
00:53
Sd for sleep deprivation has a significant effect on attention.
01:14
Specifically, at least one of the groups 24 -hour sleep deprived or 48 -hour sleep deprived has a different mean percentage of correct detections compared to the normal sleep group.
01:29
Number two, calculate the mean and standard deviation.
01:32
So our mean u would be 85 plus 83, 76 plus 64, 75 all divided by 5 which would be 76 .6.
01:56
And then the standard deviation, so calculate the sample standard deviation for this group using the formula.
02:14
It's going to be square root of sum of x minus x hat squared over n minus 1.
02:29
So in this case it's going to be approximately 7 .5, but you can use a statistical software calculator to find this.
02:44
And this is for our group one.
02:49
Group two, and this is our normal sleep.
02:57
This is our 24 -hour group sleep deprived.
03:02
So our mean would be 60 plus 58 plus 76 plus 52 plus 63 over 5 which is 61 .8.
03:11
And our standard deviation, use the same formula, and it's going to be approximately 9 .8...