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## AP®︎/College Statistics

### Course: AP®︎/College Statistics>Unit 11

Lesson 5: Testing for the difference of two population means

# Conclusion for a two-sample t test using a confidence interval

Given a confidence interval estimating the difference between two means, make a conclusion in a significance test about the difference between those means.

## Want to join the conversation?

• how did we find the p-value?
• the given CI is at 98% not at 99%.

Because CI is always both sided. if alpha is 0.01, it gives you 98% CI, not 99%
• There is nothing wrong with the question. (confidence level) + α should be 100%
• hello,

how to report a negative t stat after conducting a two tailed unequal variance t test? (t stat= -2.12, p= 0.03, t critical = 1.96) does that mean that the impact of treatment is mostly negative?
how a negative t stat differs when reporting from a positive t stat? (t stat = 6.59, p = 0.00, t critical = 1.96)

thank you
(1 vote)
• Oh yeah you’re right.