Step 1 :The question is asking for the conclusion regarding the publisher's claim that less than 72% of their readers own a Rolls Royce, given that a test was performed at the 0.02 level of significance and the advertiser failed to reject the null hypothesis.
Step 2 :In hypothesis testing, the null hypothesis is usually a statement of no effect or no difference. If the advertiser failed to reject the null hypothesis, it means that there is not enough evidence to support the publisher's claim.
Step 3 :Therefore, the conclusion should be: 'There is not sufficient evidence at the 0.02 level of significance to say that the percentage is less than 72%.'
Step 4 :This is a theoretical question and does not require Python code to solve.
Step 5 :Final Answer: \(\boxed{\text{'There is not sufficient evidence at the 0.02 level of significance to say that the percentage is less than 72%.'}}\)