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 = .051tail. **Attached Image** a. State the hypotheses b. Show how the t was calculated using the values from the SPSS printout. c. What is Cohen’s d?

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.5: Comparing Sets Of Data
Problem 3BGP
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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 = .051tail.

**Attached Image**

a. State the hypotheses

b. Show how the t was calculated using the values from the SPSS printout.

c. What is Cohen’s d?

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
Transcribed Image 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
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