Ninth Circuit judges are nominated by the President and confirmed by the Senate, just as are Supreme Court Justices. But in almost all cases, judges nominated to the circuit court bench have been judges at the district court level, and that is usually regional. So naturally you tend to get more conservative circuit court benches in the South (the Fifth Circuit, Texas and La, and the Eleventh Circuit, Georgia, Florida, and Alabama) whereas you get more liberal benches in the Ninth, i.e. California, Washington, Oregon.
The liberal bench currently gets overturned more than the conservative because (until recently) the Supreme Court tilted slightly right.
Whenever I get into academic mode, I go to this one site, which is highly regarded on Supreme Court inside the court type stuff, called SCOTUS Blog. If you have a chance, you might go to the main page and check it out.
But at any rate here is a look at the statistical analysis of where the Court's decisions go, and to some degree where they come from.
Statistics : SCOTUSblog
Go down to the next to last graph. It shows that of the 41 cases where they have granted review in the last term, 20 % are out of the Ninth Circuit, which is twice as much as the next one.
I cannot copy the image for some reason, but if you go to prior "stat packs" on the page (in blue near the top) and click on 2014, for example, you see that for the October 2014 term, 63 % of 9th circuit decisions were reversed. But its a limited sample size. That year, 100 % of the cases they took from the 11th, a conservative circuit, were reversed. Same with the 7th, which is generally regarded as conservative.