Please complete the handout provided in class--some more review of graphical displays and a 2 sample t-test! Enjoy!
Just in case you lost it, the problems are below...
An experiment is run to test whether daily stimulation of specific reflexes in young infants will lead to earlier walking. Twenty infants were recruited through a pediatrician's service, and were randomly split into two groups of ten. One group received the daily stimulation while the other was considered a control group. The ages (in months) at which the infants first walked alone were recorded:
With Stimulation of Reflexes: 10, 12, 11, 10.5, 11, 11.5, 11.5, 11, 12, 11.5
Control: 10, 13, 12, 11, 11.5, 11.5, 12.5, 12, 11.5, 11
1. Use an appropriate display for the data below and compare the distributions.
2. Does either have any outliers? Show the appropriate math that led to your conclusion:
3. Does the data suggest a significant difference in the age at which first steps were taken for these two groups?
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