How did you do a t test on total sales when there are only two values,
one for each group?
Paul R. Swank, Ph.D.
Professor, Developmental Pediatrics
UT Health Science Center at Houston
From: SAS(r) Discussion [mailto:SAS-L@LISTSERV.UGA.EDU] On Behalf Of Lu
Sent: Tuesday, June 07, 2005 9:54 AM
Subject: A stat question
I have a stats rather than SAS question, but I think many SAS experts
can help on this. Thank you very much in advance. We did an A/B test
to test effectiveness of 2 e-mail creatives. The results are below:
Group Order AOS Sales
A 62 $243 $15,000
B 92 $239 $22,000
* AOS stands for average order size
** Sales = AOS x Order
After I applied t-test, it shows that Group B placed significantly more
orders than Group B, but the average order size (total sales divided by
total orders) and total sales are not significantly different. I have 2
1) Is the total sales not significantly different because average order
size between the 2 groups is not significantly different?
2) Is it correct to conclude that group B has generated (92 - 62) * $239
= $ 7,170 incremental sales since Group B's total orders are
significantly different from Group A?
Your help is greatly appreciated.