compare three interventions for preterm infants, with regard to effects on the i
ID: 3313762 • Letter: C
Question
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
145
144
168
148
151
157
171
176
191
132
135
140
165
170
183
152
155
170
143
149
152
160
171
188
138
143
152
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.)
NNS
NNSR
R
145
144
168
148
151
157
171
176
191
132
135
140
165
170
183
152
155
170
143
149
152
160
171
188
138
143
152
Explanation / Answer
Ans:
H0:Interventions do not influence infant heart rates(means are equal)
Ha:Interventions influence infant heart rates( not all means are equal)
ANOVA table:
p-value=0.1664
As,p-value>0.01,we fail to reject null hypothesis.
We do not have sufficient evidence to support the claim that intervention type does influence infant heart rate (p>0.01).
NNS NNSR R 1 145 144 168 2 148 151 157 3 171 176 191 4 132 135 140 5 165 170 183 6 152 155 170 7 143 149 152 8 160 171 188 9 138 143 152 Mean 150.44 154.89 163.75 std dev= 12.82 14.31 16.48Related Questions
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