Question

When subjects were treated with a​ drug, their systolic blood pressure readings​ (in mm​ Hg) were...

When subjects were treated with a​ drug, their systolic blood pressure readings​ (in mm​ Hg) were measured before and after the drug was taken. Results are given in the table below. Assume that the paired sample data is a simple random sample and that the differences have a distribution that is approximately normal. Using a

0.05

significance​ level, is there sufficient evidence to support the claim that the drug is effective in lowering systolic blood​ pressure?

Before

189

175

188

155

189

184

157

205

161

195

158

169

After

167

162

179

156

155

152

152

143

167

176

159

186

dentify the test statistic.

t=nothing

​(Round to two decimal places as​ needed.)

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