Howell and Nurcombe (1984) Examined 6 Month-Old Infants Who Were

Essay

Howell and Nurcombe (1984) examined 6 month-old infants who were low birthweight babies when they were born. Each child was rated on the Bayley Psychomotor Development Index. The population mean for this test is 100 and high scores mean better performance. Perform a t test, calculate the effect size index, and write a conclusion about what to expect (on the average) of low birthweight babies.102 , 96 , 110 , 99 , 112 , 103 , 99 , 109 , 107 , 104