Question 6

The Jedi council are planning on providing all Jedis with double ended lightsabers, but are concerned that the public may mistake Jedis carrying these special lightsaber weapons as evil. To examine public sentiment, the number of tweets containing the words “evil jedi” were counted for three days before and after changing the weapons. As a control the number of tweets containing the words “jedi council” were counted before and after the changeover. Below is the data of the tweet counts:

(a) Estimate the effect caused by the change in time.

(b) Estimate the effect for the interaction.

(c) What does the value of the interaction effect tell us about the tweet counts?

(d) The randomisation distribution for c under the assumption that γ = 0 is shown below. What conclusion can you draw about the effect of the advertising campaign? Explain.