Last years spell-a-thon spelling test for first grade class had 15% more words with with four or more letters than this years spelling test. Next year , there will be 5% less than this year . What percent more words have four or more letters in last years test than next years?

which of the following sets of data would produce the largest value for an independent-measures t statistic? the two sample means are 10 and 20 with variances of 20 and 25 the two sample means are 10 and 20 with variances of 120 and 125 the two sample means are 10 and 12 with sample variances of 20 and 25 the two sample means are 10 and 12 with variances of 120 and 125