Analyze the problem very well, choose the correct test and the correct formula to use. ONCE test and formula are wrong, everything else is wrong.

1. The following are the weights in pounds of 15 students before and after six months of attending aerobics. Is aerobics effective in reducing weights? Test at 5% level of significance.

Weight Before

243

179

201

165

183

153

170

180

212

169

178

209

158

192

144

Weight After

231

173

199

162

179

152

164

177

207

170

171

196

159

190

140

d

d2

d =

d2=

SCORING:

null hypothesis and symbolic form= 2 points

alternative hypothesis and symbolic form= 2 points

test to be used = 1 point

level of significance = 1 point

computation = 5 points

comparison of values = 1 point

decision = 1 point

conclusion = 1 point

bonus = 1 point