A pharmaceutical company claims that its new drug reduces systolic blood pressure. The systolic blood pressure (in millimeters of mercury) for nine patients before taking the new drug and 2

2 hours after taking the drug are shown in the table below. Is there enough evidence to support the company's claim?

Let d=(bloodpressurebeforetakingnewdrug)(bloodpressureaftertakingnewdrug)

d=(bloodpressurebeforetakingnewdrug)(bloodpressureaftertakingnewdrug). Use a significance level of =0.05

=0.05 for the test. Assume that the systolic blood pressure levels are normally distributed for the population of patients both before and after taking the new drug.

Patient123456789Blood pressure (before)198

198182

182174

174204

204181

181183

183186

186168

168192

192Blood pressure (after)172

172158

158165

165196

196173

173172

172176

176156

156176

176