Question

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.)

Answer 1