In 13-24, determine whether the given sequence is arithmetic, geometric, or neither. If the sequence is arithmetic, find the common difference and the sum of the first n terms. If the sequence is geometric, find the common ratio and the sum of the first n terms. (un) = (23n)

Stat notes week 13 Confidence intervals for the mean and proportions Suppose X is a random variable with known standard deviation σ= 1.7. Construct a two sided symmetric 95% confidence interval using the sample mean X = 8.5 from n=25 samples - X -ε