A random sample of size n is to be drawn from a population with a mean = 500 and sd = 100. What sample size would be necessary to ensure a standard error of 25? Sample sizes are whole numbers.

Answer 1

SEm = SD/√n

25 = 100/n

Solve for n.

Are you also anonymous?

Please only post your questions once. Repeating posts will not get a quicker response. In addition, it wastes our time looking over reposts that have already been answered in another post. Thank you.

Answer 2

In a​ poll, 1,001 adults in a certain country were asked whether they favor or oppose the use of​ "federal tax dollars to fund medical research using stem cells obtained from human​ embryos." Based on the poll​ results, it is estimated that 47​% of adults are in​ favor, with a margin of error of 4 percentage points. Use the given statistic and margin of error to identify the range of values​ (confidence interval) likely to contain the true value of the population parameter.