What is the best estimate of 5 1/3 x 1 4/5 x 6 7/8 x 3 2/5 ?
144
180
210
336

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.

How can you check that you have correctly converted frequencies to relative frequencies?

F(x) = 2x + 1? h(x) = x – h(x) = x + h(x) = x – 2 h(x) = x + 2