Question

Proponents of alternative medicine claim that the herb St. John’s
Wort is effective in relieving depression. An independent agency will
conduct a test to determine if the percentage of people who claim their
symptoms are relieved by St. John’s Wort is at least 50%. Describe (in
sentences) at Type I and Type II error for this test.

Answer 1

Type I error = The percentage of people who claim their symptoms are relieved by St. John’s Wort is at least 50% is not found to be at least 50% when it is at least 50%.

Type II error = The percentage of people who claim their symptoms are relieved by St. John’s Wort is at least 50% is found to be at least 50%when it is not at least 50%.