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.

Data can be found here:

Google SheetsLinks to an external site.

MS Excel fileDownload MS Excel file

Use a 1% level of significance to test the claim that interventions do not influence infant heart rates.

Hypotheses:

H0:NNS=NNSR=R (all three interventions produce equal average heart rates in the infants)

H1:NNSNNSRR (at least one intervention produces an average heart rate different than

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.)

Non-Nutritive Sucking	Non-Nutritive Sucking plus Rocking	Rocking
143	149	152
145	144	168
132	135	140
171	176	191
148	151	157
150	148	161
160	171	188
138	143	152
175	180	202