Final answer:
The fear of public speaking is one of the most common concerns among individuals. Hypothesis testing can be conducted to determine if the percentage of students at a school who fear public speaking is less than 40 percent. Anxiety disorders, such as OCD, panic disorder, PTSD, and phobias, can also cause feelings of fear and worry.
Step-by-step explanation:
According to various studies and reports, the fear of public speaking is one of the most common concerns among individuals. It is estimated that around 40 percent of Americans fear public speaking, as cited by Toastmasters International. For example, a Gallup Poll reported that 40 percent of Americans fear public speaking. Additionally, a student conducted a survey at her school and found that 135 out of 361 schoolmates reported fearing public speaking.
Hypothesis testing can be conducted to determine if the percentage at her school is less than 40. The student's hypothesis could be that the percentage of students at her school who fear public speaking is less than 40 percent. By analyzing the survey data and conducting appropriate statistical tests, she can determine if her hypothesis holds true.
Anxiety disorders are also common sources of fear and worry. These disorders involve feelings of fearfulness that last for months at a time. Examples of anxiety disorders include obsessive-compulsive disorder (OCD), panic disorder, post-traumatic stress disorder (PTSD), and various phobias.