A spinner has six equal-sized sections numbered 1, 1, 2, 2, 3, and 4. What is the sample space for the spinner? A. {1, 2, 3, 4}
B. {4, 3, 2, 1}
C. {1, 2, 2, 3, 4}
D. {1, 1, 2, 2, 3, 4}

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.