Concrete details should be left out of informational essays. make writing more interesting to read. are also know as generalizations. are to be used sparingly in writing.

Summary statistics given for independent simple random samples from two populations. use the pooled t-interval procedure to obtain specified confidence interval. x1=71.6, s1=3.9, n1=11, x2=67.9, s2=3.4, n2=9 determine a 99% confidence level.