Hi guys, I need some help with this one ( mainly "1" and "2" ):

A research check tails of 40 cats. these are the results:

average s.d n

Males 190 15 22

Famales 180 12 18

1. check the hypothesis that the tails of the males are longer, with significant level of 10%.

2. what is the significant of the result ? ( p value )

3. build a confidence interval of 90% to the mean difference