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.

NNS	NNSR	R
132	135	140
148	151	157
150	148	161
138	143	152
145	144	168
165	170	183
160	171	188
143	149	152
171	176	191

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

Results:
p-value = 9.97%

Conclusion:
We lack sufficient evidence to support the claim that intervention type does influence infant heart rate (p > 0.01).