In: Math
Ross Simons, a jewelry cataloguer, has tested two creatives for the cover of the spring 2018 catalogue. The themes were inspired for the birthstones of April and May. The timing of the drops for the two executions was March 15, 2017. The results are shown below and based on the number of orders from each test cell. The interest is in whether the cover, which is the only difference in the two catalogues, can be associated with a difference in average order size.
Cell | N | Average Order $ | Stand. Dev. Order $ |
(April) Diamond | 480 | $187.78 | $27.93 |
(May) Emerald | 503 | $192.03 | $25.88 |
Construct a 95% confidence interval for the difference between the average order size in dollars for each cell. Remember to then fully interpret results including a recommendation for the business decision on the indicated strategy.