Express the confidence interval 22.5%

If n = 200 and ˆpp^ (p-hat) = 0.85, construct a 95% confidence interval.Give your answers to three decimals ____< p <_____

Using a T table, find the critical value of t for a 99% confidence interval with dfequals 14.

An SRS of 450 high school seniors gained an average of ?¯=20 points in their second attempt at the SAT Mathematics exam. Assume that the change in score has a Normal distribution with standard deviation ?=49 . (a) Find a 95% confidence interval for the mean change in score ? in the population of all high school seniors. (Enter your answers rounded to two decimal places.) lower bound of confidence interval:     upper bound of confidence interval:     (b) What is the margin of error for 95% ? (Enter your answer rounded to two decimal places.) margin of error:     (c) Suppose we had an SRS of just 100 high school seniors. What would be the margin of error for 95% confidence? (Enter your answer rounded to three decimal places.) margin of error:

Construct a confidence interval for P₁ P2 at the given level of confidence. X₁ = 369, n₁ = 508, X₂=426, n₂ = 599, 95% confidence % The researchers are confident the difference between the two populatio proportions, P₁-P₂, is between and (Use ascending order. Type an integer or decimal rounded to three decimal places as needed.)