Classify the model as exponential growth or exponential decay. identify the growth or decay factor and the percent of increase per time period. y=10(0.2)^t plz !

Scores on the cognitive scale of the bayley-scales of infant and toddler development range from 1 to 19, with a standard deviation of 3. calculate the margin of error in estimating the true mean cognitive scale score, with 99% confidence, if there are 12 infants and toddlers in a sample.