Is the interaction significant at the .05 level? Why or why not? Is the interact

Question

Is the interaction significant at the .05 level? Why or why not? Is the interaction significant at the .01 level? Why or why not?
What's the precise probability that the null hypothesis is true?
Excerpt from the Article The participants in this study were the 62 members of the nursing staff working in a 47-bed Department of Veterans Affairs spinal cord injury center The purpose of this study was to evaluate the effectiveness of the training course in freducing discomfort when engaging in difficult] staff interactions. A behavioral approach was selected as the basis for the training. It consisted of a combination of techniques such as lecture and discussion, modeling, and behavior rehearsal, with feedback provided by group members and the trainers.. The study included the Spinal Cord Injury Assertiveness Inventory (SCIAI) as preprogram and postprogram measures to assess the effectiveness of the training. At the request of the nurse managers, all nursing staff participated in the training, so we had no control group. A repeated measures ANOVA on the total score of the SCIAI showed no simple effect fi.e, main effect, p 1069] related to the time of testing lie,, the mean on the pretest (M - 2.40) for all participants was not significantly different from the mean on the posttest for all participants (M·2.27)--However, when we examined the participants' education, we found a statistically significant interaction effect between the time of testing and education (F2.58" 3.468, P . .0378) (see Figure 1). After the class, the NAs (nursing assistants), all of whom had a high school edfcation, showed an increased discomfort level, whereas the discomfort level of the LVNs (icensed vocational nurses) and the RNs (registered nurses) decreased. However, paired, tests on the various groups, data showed that only the RNs (t-2692. df-36, p-0107) exhibited a statistically significant change in their discomfort level related to time of testing Nursing assistants Licensed vocational runes Registered nurses 2.8 2.6 2.1 20 Pretest Time of Testing Figure Ineeraction between time of testing (pretest vs, post- est) and educational level

Explanation / Answer

Is the interaction significant at the .05 level? Why or why not?

P- value of interaction effect is 0.0378.

Since p - value is less than 0.05, interaction effect is siginificant.

b)

At 0.01 level

Since p - value is greater than 0.01, interaction effect is not siginificant.

c) the precise probability that the null hypothesis is true is 1-0.0378 = 0.9622

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