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For confidence interval, the formula is mean difference PLUS critical t x s difference. If it's a plus sign, does that mean it is upper

For confidence interval, the formula is mean difference PLUS critical t x s difference. If it's a plus sign, does that mean it is upper limit? and vice versa, if its a minus, that's lower limit?

Do I reject or retain my Ho if my observed t value is 2.73 and the answers I get for my confidence interval is 5.3969 and 0.60?

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