PROC UNIVARIATE includes the variable label in the report. The report
also provides a message to indicate that the lowest mode is shown in the
Basic Statistical Measures table. The Modes table reports all the mode values.
The mean of 3.08 indicates an average decrease in test scores from
Test1 to Test2. The 95 percent confidence limits (11.56, 5.39), which includes
0, and the tests for location indicate that the decrease is not statistically
significant.
The Tests for Location table includes three hypothesis tests. The Student's t statistic assumes that the data are approximately normally distributed.
The sign test and signed rank test are nonparametric tests. The signed rank
test requires a symmetric distribution. If the distribution is symmetric you
expect a skewness value that is close to zero. Because the value 1.42 indicates
some distribution skewness, examine the sign test to determine if the difference
in test scores is zero. The large pvalue (.7744) provides insufficient
evidence of a difference in test score medians.
Because PROC UNIVARIATE computes a symmetric
confidence interval, some coverages for the confidence limits are less than
99 percent. In some cases, there are also insufficient data to compute a symmetric
confidence interval, and a missing value is shown. Use the TYPE=ASYMMETRIC
option to increase the coverage and reduce the number of missing confidence
limits.
