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 9 out of 13 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.)

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