00:01
So you have four brands of cookies, and i'm going to put them, well, i'll put them the way you have.
00:04
You have the chips ahoy, the mrs.
00:07
Fields, a kebler, and famous amos, i believe.
00:11
And you were found to have the observed values being 25, 40, 20, and 35.
00:20
And your first question was you wanted to find out if there was a difference in preference, and you had a sample size of, excuse me, 120 people, that these add.
00:30
Up to 120 for your observed.
00:32
And so your null hypothesis would be that the proportion is equal to 0 .25 for all four cookie types.
00:50
And alternately, that the proportion is not 0 .25 for at least one.
00:58
And let me does not equal 0 .25 for at least, least one of the four cookie types.
01:19
Hopefully you can read my writing.
01:21
And then you talked about the expected.
01:22
This is a goodness of fit test.
01:25
And i think your part b is to answer what all the expected values are.
01:28
And the expected values are going to be the 120 divided by the four groups of 30.
01:34
So, so, each of those has the expected value being 30.
01:39
Now, you're asked in part c to give what the degrees of freedom is.
01:44
And then degrees of freedom is n minus one number of categories you have...