00:01
All right, so in this question we're asked about some sample data here we have on times from a sample of 10 plantings and we're asked to using a, so this just 10 pieces of samples, we're asked whether the alpha equals 0 .05 significance level test to see whether the mean tree planting time differs from two hours.
00:19
So our hypothesis is that the mean tree planting time is two hours.
00:24
We want to test this.
00:26
Our alternative hypothesis here is just that it's not two hours, so we're going to be using a two -sided t -test here.
00:33
So you should go, first thing you should do is you go in the data and compute the mean and standard deviation.
00:38
I have done this already, so i got the mean was, and you should double check me on this since the data is a little bit confusingly written in the problem, but i got that it was 2 .2 was the mean and the standard deviation was 0 .516 approximately.
00:53
Now recall that our t -statistic is, looks very basically a z -score, looks, it's a t -statistic though, so it's x minus mu over the standard error...