A researcher would like to evaluate the effectiveness of a pain-relief patch designed for lower back pain. Prior to test

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A researcher would like to evaluate the effectiveness of a
pain-relief patch designed for lower back pain. Prior to testing
the patch, each of n = 9 patients rates the current level of back
pain on a scale from 1 to 10. After wearing the patch for 90
minutes, a second pain rating is recorded. The data are as
follows:
Do the results indicate a significant difference? Use a
two-tailed test with
The mean for the sample of difference score is _____ and the
variance is______ . The standard error is _____ , the df is _____ .
Our calculated t-value is______. For this reason we _____ the null
hypothesis
please post work.