A business analyst has been asked to confirm the effectiveness of a marketing campaign on people’s attitudes to global warming. To confirm that the campaign was effective a group of 500 people were randomly selected from the population and asked the simple question about whether they agree that national governments should be concerned with an answer of ‘Yes’ or ‘No’. The results are as shown in Table 7.10.

At a 5% level of significance is there any evidence that the campaign has increased the number of people requesting that national governments should be concerned that global warming is an issue? Answer this question using both the critical test statistic and p-value.

Transcribed Image Text:

Before campaign Table 7.10 Yes No Yes 202 89 After campaign No 115 75