I\'m doing a study on hours of sleep for college males vs females. The null hypo

Question

I'm doing a study on hours of sleep for college males vs females. The null hypothesis is: Male and female college students sleep the same amount of hours each night. The alternative hypothesis is: Male college students sleep a different amount of hours each night than female college students.

With hours from 30 males and 30 females, I used a 0.05 level of significance and did a two-tailed t-test. I got a p-value of .003 and a confidence interval of (-1.54, -0.3268). Can someone please tell me what the negative CI means, and how to word the results?

Explanation / Answer

Negative CI only implies that the difference of true means is plausibly in this CI with 95% confidence, i.e, that the first mean is lower than the second mean by an amount in the range (0.3268 , 1.54) with 95% confidence.

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