Question

Lecture19: Problem 3 Previous Problem List Next (1 point) Studies have suggusted that twins, in their early years, tend to have lower IQs and pick up language more slowly than non-twins. The slower intellectual growth may be caused by benign parental neglect. Suppose it is desired to estimate the mean attention time given to twins per week by their parents. A sample of 30 sets of two-year-old twin boys was taken, and after one week the attention time received was recorded. The mean to be 31.2 hours with a standard deviation of 11.7 hours. Use this information to contruct a 92% confidence interval for the mean attention time given to all twin boys by their parents, assuming that the population is approximately normally distributed. Round the endpoints to one decimal place. Confidence interval:( Note: You can earn partial credit on this problem. Note: You can get a new version of this problem after the due date.

Answer 1

PAGE NO DATE - n=30 i = 31.2 hours s: 11.7 hours 92 confidence interoval fro mean - ( 31.2 I 1.814 . ( 31.2 I 3.8749 ) ( 27.3, 3501 ) 92.j. confidence in terval ( 27.3 35.1) sdanned with CamScanner