An online advertising agency is testing the effectiveness of a new ad campaign. The campaign sends out discounts to previous customers of an online shop. The percentage of previous customers targeted...

An online advertising agency is testing the effectiveness of a new ad campaign. The campaign sends out discounts to previous customers of an online shop. The percentage of previous customers targeted who end up using the discounts is called "conversion ratio". In this particular instance, the agency sent discounts to a sample of 120 previous customers, 39 of which made a purchase using these discounts.

Calculate the conversion ratio for this sample and then calculate the 99% confidence limits of the conversion ratio based on this sample. Provide your answers in percentage terms rounded to 1 decimal place, if necessary. (You will have the option to upload your workings through the next question).