Babies who are small at birth (low birth-weight infants or LBW infants) are at risk for future developmental problems. These infants can be difficult to parent because they appear to be relatively unresponsive to their parents. An intervention program was designed to make mothers more aware of their infant's signals and more responsive to their infants. Researchers expect that the intervention program will decrease some of the developmental issues associated with LBW. Forty-one LBW infants born at Methodist Hospital in Houston, Texas between January 2010 and March 2011 were randomly assigned to either the experimental (mother's received intervention training; n = 18) or the control group (n = 23). At 24 months of age, each infant was administered the Bayley Mental Development Index (MDI). The MDI provides a measure of development where higher scores indicate greater developmental progress. Do the data suggest that the intervention

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I.
Babies who are small at birth (low birth-weight infants or LBW infants) are at risk for future developmental
problems. These infants can be difficult to parent because they appear to be relatively unresponsive to their
parents. An intervention program was designed to make mothers more aware of their infant's signals and
more responsive to their infants. Researchers expect that the intervention program will decrease some of the
developmental issues associated with LBW. Forty-one LBW infants born at Methodist Hospital in Houston,
Texas between January 2010 and March 2011 were randomly assigned to either the experimental (mother's
received intervention training; n= 18) or the control group (n = 23). At 24 months of age, each infant was
administered the Bayley Mental Development Index (MDI). The MDI provides a measure of development
where higher scores indicate greater developmental progress. Do the data suggest that the intervention
training influences development among LBW infants?
State the hypotheses, critical values with df and alpha = .05, calculate the test statistic and show all your
work for each step of the calculations, answer the question stated above in bold-italics AND state your
conclusion using the 3-sentence APA format discussed in class.
LBW infants' MDI
Control infants' MDI
96
114
127
88
127
102
137
127
114
104
119
104
109
91
109
96
143
104
116
106
114
91
143
102
109
104
117
100
127
114
112
109
112
109
98
119
91
81
114
119
102
Transcribed Image Text:I. Babies who are small at birth (low birth-weight infants or LBW infants) are at risk for future developmental problems. These infants can be difficult to parent because they appear to be relatively unresponsive to their parents. An intervention program was designed to make mothers more aware of their infant's signals and more responsive to their infants. Researchers expect that the intervention program will decrease some of the developmental issues associated with LBW. Forty-one LBW infants born at Methodist Hospital in Houston, Texas between January 2010 and March 2011 were randomly assigned to either the experimental (mother's received intervention training; n= 18) or the control group (n = 23). At 24 months of age, each infant was administered the Bayley Mental Development Index (MDI). The MDI provides a measure of development where higher scores indicate greater developmental progress. Do the data suggest that the intervention training influences development among LBW infants? State the hypotheses, critical values with df and alpha = .05, calculate the test statistic and show all your work for each step of the calculations, answer the question stated above in bold-italics AND state your conclusion using the 3-sentence APA format discussed in class. LBW infants' MDI Control infants' MDI 96 114 127 88 127 102 137 127 114 104 119 104 109 91 109 96 143 104 116 106 114 91 143 102 109 104 117 100 127 114 112 109 112 109 98 119 91 81 114 119 102
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