Please help me find the p-value of the following question. I attempted to conduct a z-test but am not confident in the answer I got. For a two-tailed test, the p-value I found was 19.6864. Is this correct? Thank you.

In 2009, the FDA Oncology Drug Advisory Committee (ODAC) recommended that the drug Avastin be approved for use in glioblastoma, a form of brain cancer. Tumor shrinkage after taking a drug is called a response. Out of 85 patients in a study to investigate the effectiveness of Avastin, 24 exhibited a response. Historically, response probabilities for brain cancer drugs were approximately 0.05.

Assess whether there is evidence that the response probability for Avastin is different from that of previous drugs. Conduct an appropriate hypothesis test. Be sure to report the p-value with your conclusion