The national norm for third graders on a standardized test of reading achievement is a score of 27. Mrs. Johnson obtains the mean score on the test for a random sampling of third graders from her school district. The results for Mrs. Johnson's sample are $\overline{X} = 33.1, s_X = 5.2 and n=30$ (a) Construct the 95% confidence interval for her population mean score. (b) Construct the 99% confidence interval for her population mean score. (c) What generalization is illustrated by a comparison of the answers to (a) and (b)?

Question

Quizplus · Accepted Answer

The Answer is (a)
(a) (b) (c) the higher the level of confidence, the wider the interval

(b)

(c) the higher the level of confidence, the wider the interval

The National Norm for Third Graders on a Standardized Test X‾=33.1,sX=5.2andn=30\overline{X} = 33.1, s_X = 5.2 and n=30X=33.1,sX​=5.2andn=30

The National Norm for Third Graders on a Standardized Test $\overline{X} = 33.1, s_X = 5.2 and n=30$