In: Statistics and Probability
A scientific article stating that approximately 9.5% of American adults will suffer from depression or depressive illness in any one year (National Institute of Mental Health). A researcher thinks the true proportion of American adults who suffer from depression or depressive illness in a given year is lower than 9.5%, a survey of 100 adults found 7 of them suffered from depression or depressive illness. Use a 0.05 significance level to test the researcher’s claim.