t statistic

t statistic, t distribution

the statistical distribution of the ratio of the sample mean to its sample standard deviation for a normal random variable with zero mean. It is the basis of various t-tests used to make inferences about the mean of a normal variable.

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Patient discussion about t statistic.

Q. Do you know if Propecia can truly stop hair loss and even grow back hair. do you have any statistics about it? do you know if there are any side effects to this medication?

A. it does work but there is some side affects, as in E.D. while you are on the med.

Q. what is the statistic of smoking people , let say , people who smoked for almost 30 years , to get a lung cancer or any other diseases related to smoking ? will they be in a risk group ? what are the variable of thing like that ?

A. although it is REALLY proven that smoking is correlated with higher incidence of lung cancer (and other diseases), but there are also a lot of smokers who are "healthy" where they don't have any complain or any manifested diseases.

Compared to nonsmokers, men who smoke are about 23 times more likely to develop lung cancer and women who smoke are about 13 times more likely. Smoking causes about 90% of lung cancer deaths in men and almost 80% in women.

But I still remember clearly when I was in medical school, that my professor told me 90% cause of lung cancer is smoking, BUT 90% smokers all around this world don't have lung cancer, hehehe.. ironic, isn't it?

Q. What is the rate of alcoholism in the USA compared to the rest of the world? What is the rate of alcoholism in the USA compared to other countries in the world. I don't mean amount of alcohol consumed, but alcohol addiction/dependency. Links to your sources would be appreciated. Cheers! (pun intended)

A. here is a link to a CDC table about drinking hobbits of Americans:
http://www.cdc.gov/nchs/data/hus/hus07.pdf#068
here is an article about it, and it gives good links also:
http://www.articlesbase.com/self-help-articles/alcoholism-statistics-enlightening-experience-for-everyone-540401.html