z test hypothesis

[demolay]

in z test hypothesis if we look something fewer than X%, do we use upper or lower tail test?

[quark]

It's a left(lower)-tailed test.

[jazmine]

Does anybody know a website, or where i could find articles that use hypothesis tests to prove right/wrong claims? (real problems solved) :confused: I've been searching for days.

[JohnM]

Does anybody know a website, or where i could find articles that use hypothesis tests to prove right/wrong claims? (real problems solved) :confused: I've been searching for days.

Try Google Scholar (www.scholar.google.com), which provides links to academic articles, and would definitely have examples that include hypothesis tests.