00:01
Hi, i'm david and i'm here to have you and send your question.
00:03
Now let me pick up your question here.
00:06
In the question here we are going to discuss about the hybrid testing.
00:10
Now in this question we want to test that if the average average sales have changed this year, that from the last year we have the average equal to the 107 .5 million.
00:25
That will be this year, but the last year we will have it will equal to the 100 million.
00:30
Million.
00:31
And to test it, we will have the noon hypothesis that the mean equal to the 100 million last year versus the own 22 hypothesis that the mean this year has changed means that we will test for not equal to the 100.
00:49
And here we have given the symbol n equal to the 50, the x bar equal to the 107 .5 and the s equal to the 207 .5 and the s equal to the 20 .5.
01:02
So the first thing we need to do is we need to find the test statistics denoted by the t.
01:08
The formula will be the xx minus the mean over s divided square of n...