The circle below is centered at the point (4,1) and has a radius of length 2.
what is its equation?
o a. (x-1)2 + (y - 4)2 = 4
o b. (x+4)2 + (y- 1)2 = 4
o c. (x-4)2 + (y- 1)2 = 4
o d. (x + 1)2 + (y-4)2 =
22

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.