00:01
So in this class, we want to test if the average here of like the amount of chocolate chips in the bag is less than what it was supposed to be inside the bag, which is like 408 grams.
00:18
So this means that at the same time we are testing the opposite of this.
00:23
So this one is our new hypothesis because it includes the equal sign and the other one the alternative.
00:30
This is the claim because this is what you're interested in testing.
00:34
So in this case what we need to do is find the test statistic, which is given by the difference between the average amount found in the sample minus the value that was supposed to be the setting, divided by the standard deviation, divided by the square root of the sample size.
00:51
This will give us the value negative 165.
00:54
Then we can find the p -value for this test, considering that we have the last sign in the alternative as a probability in the t -distribution, and we are using the t -distribution because our sample size here is less than 30, which means that we need to account for the degrees of freedom of the t -distribution, which is given by the sample size minus 1...