City of Daytona Beach was worried that new ordinance that had raised beach driving fee might have negative impact on tourism. City has engaged you to examine this problem. You collected data from 20 different days (10 before and 10 after) reflecting number of vehicles on beach before and after ordinance, taking care to control for weather conditions and other variables as much as possible.
Data
|
Day
|
Vehicles on the beach before the new ordinance
|
Day
|
Vehicles on the beach after the new ordinance
|
|
8-1-03
|
221.00
|
8-1-04
|
245.00
|
|
8-2-03
|
222.00
|
8-2-04
|
222.00
|
|
8-3-03
|
343.00
|
8-3-04
|
333.00
|
|
8-4-03
|
234.00
|
8-4-04
|
111.00
|
|
8-5-03
|
112.00
|
8-5-04
|
444.00
|
|
8-6-03
|
221.00
|
8-6-04
|
111.00
|
|
8-7-03
|
222.00
|
8-7-04
|
111.00
|
|
8-8-03
|
343.00
|
8-8-04
|
222.00
|
|
8-9-03
|
234.00
|
8-9-04
|
123.00
|
|
8-10-03
|
112.00
|
8-10-04
|
123.00
|
a) Define the null hypothesis.
b) What test did you use?
c) Mention the results. Are they statistically important?