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please clarify the t stat, t critical , and the standard error of d bar...

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Accounting

please clarify the t stat, t critical , and the standard error of d bar and the p value. Thank you. image
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QUESTION 04 (10 points) - Paired t-Test for Mean Comparison with Dependent Samples -To study the effects of an advertising campaign at a supply chain, several stores are ranuomly selected with the following observed before- and after-advertising monthly sales revenues: 15 Let 1 and 2 be the means of old and new sales revenues, both in millions of dollars per month. (a)[7] At =0.05, test H0:21 versus H1:2>1. Sketch the test. Interpret your result. (b)[3] Sketch and find the p-value of the test. Would you reject H0 if =0.10 ? \begin{tabular}{|c|c|c|c|c|c|} \hlinedf & 4 & 5 & 4 & 5 & 4 \\ \hline T.INV (v,df) & 3.7469 & 3.3649 & 2.1318 & 2.0150 & 1.6226 \\ \hline T.DIST (tv,df,1) & 0.9400 & 0.9589 & 0.9614 & 0.9471 & 0.9746 \\ \hline \end{tabular}

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