A manufacturer of household cleaning products is interested in increasing customer awareness of its new environmentally sustainable range. The company recruits a sample of 44 customers. 22 of these customers were sent a publication which included advertising materials about the new cleaning products. Two weeks after this, all 44 customers were asked to complete a survey about their awareness of the new products. The company wants to know if the advertising campaign is worth administering to all of its customers. In other words, are the awareness scores of those who were exposed to the advertising materials significantly higher than those of the group that was not exposed. 

You have been provided with data comprising the awareness levels of each customer, broken down according to whether or not they had been exposed to the advertising campaign.

Provide descriptive statistical and graphical summaries of the two sets of data. Suggested word count 100-200 words

Analyse the data using an independent samples t-test. Suggested word count 300-400 words

• It now transpires that only 22 customers were involved in the survey, and their awareness was measured before being sent a publication that included advertising materials and then again two weeks later. Each row of the data corresponds to an individual customer with awareness levels before and after exposure. Analyse the data using a paired t-test. Suggested word count 300-400 words

Use a suitable non parametric test to investigate the impact of the advertising campaign on awareness. Suggested word count 100-200 words

Compare the results of each test and state, with an explanation, which test is most appropriate. Suggested word count 300-400 words

• Provide a summary of your findings, suitable for inclusion in a management report. Suggested word count 100-200 words