2022 Introduction to Statistics in Research Mitchell 2nd ed

I N T R O T O R E S E A R C H : D A T A V I S U A L I Z A T I O N & C O M M O N S T A T T E S T S

PAIRED T-TEST SAMPLE WRITE-UP The average posttest score after the training intervention had a mean of 82.74 with a standard deviation of 6.84 compared to the pre-test score of 65.45 with a standard deviation of 8.46. A paired t-test was used to test the null hypothesis. RQ1: What is the difference in understanding employee ethics after a training intervention? To test the paired difference, a pre-test score was taken before the training intervention and the same subjects took a posttest. As depicted in Table XX, there was a significant difference between the mean scores understanding employee ethics after the training intervention. Training method A had sales of (Mdn = $1540, n=11) and were higher than those in training method B (Mdn = $1300, n=11) . A Mann-Whitney test indicated that this difference was statistically significant, U = 22.5, Z = -2.497, p =.011, with a larger effect size, r = -.5324, 95% CI [80, 510]. PAIRED T-TEST SAMPLE TABLES In this section, let’s look at a couple of examples. The first example is set up for one test and it does not include the confidence interval. The study used for this example had two rounds of pre-test and posttest datasets; however, I’ve only shown you one of the datasets to show you how to write it up. Descriptive Statistics for Research Variable_________________________________________________ Paired Scores Before and After N Range Minimum Maximum M SD Std. Error Mean _________________________________________________________________________________ Pair 1 Pre-test 398 58.46 35.32 93.78 65.45 8.46 .42 Posttest 398 42.12 59.83 101.95 82.74 6.84 .34 _________________________________________________________________________________ Table XX

Table XX

Results of Paired t-test, Employee Ethics _______________________________________________________________ M Error of the Measure Difference SD Mean t p Difference (Post minus Pre) 17.30 9.50 .47 36.31 <.001 _______________________________________________________________

The second table assumes that you will add other statements. For example, you may have conducted a survey with the training that may be relevant. Again, the confidence interval would be placed in narrative if not included in the table.

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