Confidence interval for the difference between two population means, independent samples.

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The description of finding the confidence interval for the difference between two population means, independent samples, sampling from two groups, is described both by formula and by using the TI-83 or TI-84 graphing calculator statistics software. The interpretation of the results of the confidence interval, and what it tells us about the comparison of the two means is also discussed.
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Thank you very much. Marvellous. Crystal clear.

HanySalem
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When it is higher than 30 then will use the Z, can i use same formula ma'am?

dineroscherry