SOLUTION: What was the value of the observed t-statistic and its associated degrees of freedom? Group Statistics Cartoon Era N Mean Std. Deviation Std. Error Mean Number Screen Chang

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Question 1170827: What was the value of the observed t-statistic and its associated degrees of freedom?

Group Statistics
Cartoon Era N Mean Std. Deviation Std. Error Mean
Number Screen Changes / Stimulation per minute 1990s 185 14.5270 5.27497 .38782
2000s 199 15.8241 5.49166 .38929

Independent Samples Test
Levene's Test for Equality of Variances t-test for Equality of Means
F Sig. t df Sig. (2-tailed) Mean Difference Std. Error Difference 95% Confidence Interval of the Difference
Lower Upper
Number Screen Changes / Stimulation per minute Equal variances assumed 1.865 .173 -2.357 382 .019 -1.29709 .55031 -2.37912 -.21507
Equal variances not assumed -2.360 381.587 .019 -1.29709 .54951 -2.37753 -.21666
 
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Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
The first one is t(df=381.59)=-2.36
There is a formula for degrees of freedom in this instance, but I would use n1+n2-2, and with this many degrees of freedom, it is almost the same as the formula and almost the same as z itself.
I'm unclear regarding the second part.