A pharmaceutical company proposes a new drug treatment for alleviating symptoms of PMS (premenstrual syndrome). In the first stages of a clinical trial, it was successful for 7 out of 11 women. a. Construct a 95% confidence interval for the population proportion b. Is it plausible that it is successful for only half the population? Explain a A 95% confidence interval for the population proportion is (Round to two decimal places as needed.) Carr