Paired Samples Test Paired Differences 95% Confidence Interval of the Difference Std. Error Mean Std. Deviation Mean Lower Upper df Sig. (2-tailed) Pair 1 before - after -6.00000 6.63325 2.00000...

A researcher thinks he has developed a new technique to reduce proof-reading errors. Eleven volunteers from a publishing firm practice the technique for a week and then they are asked to proofread a 10-page document. Errors on this test were compared to their errors prior to practicing the new technique. Evaluate the results of her data using

α = .05_1tail.

**Attached Image**

a. Show how the 95% confidence interval was calculated.

b. State the conclusion in APA format.

Extracted text: Paired Samples Test Paired Differences 95% Confidence Interval of the Difference Std. Error Mean Std. Deviation Mean Lower Upper df Sig. (2-tailed) Pair 1 before - after -6.00000 6.63325 2.00000 -10.45628 -1.54372 -3.000 10 .013