The current advertising campaign for a laundry detergent would be changed if less than 30 percent of the consumers like it. A random sample of 300 consumers were surveyed, and 84 respondents indicated that they liked the campaign. Should be campaign be changed and why?

1. Formulate the null and alternative hypotheses.

2. Which statistical test is appropriate to use?

3. Conduct calculations to draw a conclusion. (Hint: To infer whether the test statistic is significant you need to know the degrees of freedom (df). The formula for the df = c 1, where c is the number of independent categories.)