Question

We wish to compare three interventions for preterm infants, with regard to effects on the infants’...

We wish to compare three interventions for preterm infants, with regard to effects on the infants’ heart rates: Nonnutritive Sucking (NNS), Nonnutritive Sucking plus Rocking (NNSR), and Rocking (R). Nine infants are randomly assigned to six different orderings of the three treatments. Heart rate, the dependent variable, is measured after each treatment. The data are summarized in the following table.
(Click herefor the data set in Google Sheets)

NNS

NNSR

R

157

162

176

150

148

161

143

149

152

145

144

168

165

170

183

160

171

188

171

176

191

175

180

202

152

155

170



Using a 1% level of significance, test the claim that interventions do not influence infant heart rates (i.e. mean heart rates are equal for all three interventions).

Results:
p-value =____ (round answer to nearest hundredth of a percent – 2.35%)

Conclusion:
We____ sufficient evidence to support the claim that intervention type does influence infant heart rate (p___ 0.01). (Use “have” or “lack” for the first blank and “<” or “>” for the second blank.)

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