In a study of children with a particular disorder, parents were asked to rate their child on a variety of items related to how well their child performs different tasks. One item was “Has difficulty organizing work,” rated on a five-point scale of 0 to 4 with 0 corresponding to “not at all” and 4 corresponding to “very much.” The mean rating for274 boys with the disorder was reported as2.38 with a standard deviation of1.08. (Round your answers to four decimal places.)
Compute the 90% confidence interval.
Compute the 95% confidence interval.
Compute the 99% confidence interval.
Explain the effect of the confidence level on the width of the interval.