Y
Interval
1
Average rate
of change
2
2
9
3
AWON
27
18
O to 1
1 to 2
2 to 3
3 to 4
4 to 5
5 to 6
لالالالالا
54
81
243
729
162
486
6
1
Find the average rate

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.