If n=7 and r=21, compute a 98% confidence interval for p.
2007-07-23 17:29:51 · 2 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
If n is the number of values and r is the range, there is no real way to calculate a confidence interval. For a confidence interval, you will need the mean, x, and the standard deviation, sigma, and either a sample size over 30 or the assumption that the population is normal or approximately normal. Also, is this interval 1-tailed (tail value of .02) or 2-tailed (tail value of .01)?
The formula for an interval is: i = x +-
where x is the mean, sigma is the standard deviation (either sample or population), and t* is the corresponding t-value for the degrees of freedom (look up a t-distribution table for this).
2007-07-23 17:39:03 · answer #1 · answered by tonyzhao07 2 · 0⤊ 0⤋
What do n and r stand for?
2007-07-24 00:33:25 · answer #2 · answered by cattbarf 7 · 0⤊ 0⤋