Dr. Riddle wants to examine how tax increases influence spen…

Dr. Riddle wants to examine how tax increases influence spending habits. He knows sales tax in Hogsmeade  will increase by 2% at the beginning of 2018. He then has 30 of the biggest retailers report their monthly gross every 3 months for 12 months prior to the tax increase and the every 3 months for the 12 months after the tax increase.  This is an example of what type of research design?

Dr. Riddle wants to examine how tax increases influence spen…

Dr. Riddle wants to examine how tax increases influence spending habits. He knows sales tax in Hogsmeade  will increase by 2% at the beginning of 2018. He then has 30 of the biggest retailers report their monthly gross every 3 months for 12 months prior to the tax increase and the every 3 months for the 12 months after the tax increase.  This is an example of what type of research design?