If n = 600 and ˆpp^ (p-hat) = 0.85, construct a 99% confidence interval. Round three places.

The national average SAT schore was found to be a 2140 with a standard deviation of 892.  If the test is normally distributed, find each The integer 87th percentile score   What is the probability that a students will score between a 2100 and a 2740

The time needed for college students to complete a certain paper and pencil maze follows a Normal distribution, with a mean of 80 seconds and a standard deviation of  6 seconds. You wish to see if the mean time  is changed by meditation, so you have a group of 8 college students meditate for 30 minutes and then complete the maze. It takes them an average of  = 74 seconds to complete the maze. Use this information to test the hypotheses H 0:  = 80, H a:   80 at significance level  = 0.02. You conclude that:   a. H0 should not be rejected.   b. Ha should be accepted.   c. H0 should be rejected.   d. this is a borderline case and no decision should be made.   The scores on the Wechsler Adult Intelligence Scale are approximately Normal, with  = 100 and  = 11. The proportion of adults with scores above 110 is closest to:   a. 0.14.   b. 0.25.   c. 0.33.   d. 0.18.

Help