00:01
Okay, so in a two -factor experiment, an interaction effect between factors a and b suggests that the effect of one factor depends on the level of the other factor.
00:10
Now, to observe a times b interaction, most clearly, the difference in response between levels of one factor should change across the levels of the other factor.
00:23
For example, a1 to a2 should change across the levels of the other factor, which is b1 to b2.
00:32
Now, we have the data b1, b2, a1, a2, and 50, 30, and 60.
00:45
See.
00:46
So, to highlight an interaction, if a2 under b2 is significantly higher compared to the a1 under b2, it will show that the effect of changing from a1 to a2 is different at different levels of b.
01:06
Now, for example, a2, b2 is much larger than a1, b2.
01:15
It suggests an interaction...