# Guessing P value

#### SAMAR86

##### New Member
I have a sample of 200 their body weight is normally distributed with mean 67kg and sd 20kg 95%CI (64.23, 69.77). the hypothesis is about whether mean is different between males and females, the statistical test i used to test this hypothesis is two-sample t-test. i also have the 95%CI of the estimated mean weight difference (3kg, 14kg). the question is what do you think about the p-value would it be greater or less than 0.05?
how I would know that when a lot of information regarding the two groups are missing???

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#### Dason

The 95% CI you have for the average weight difference is what will be useful for you

#### hlsmith

##### Less is more. Stay pure. Stay poor.
True and you can make a loose approximation to the standard normal to get a ~pvalue.

#### SAMAR86

##### New Member
The 95% CI you have for the average weight difference is what will be useful for you
can you explain more please? how i can intrepret it in away i know if the p value is greater or less??

#### SAMAR86

##### New Member
please can you explain in more simple way, i am not a statistical person and it's my first class in statistics

#### hlsmith

##### Less is more. Stay pure. Stay poor.
Does the interval exclude the null value (e.g. 0)?