Question

In a study on the placebo effect on 100 students, 64 were found to perform better on tests after taking a fake pill to improve concentration. What is the experimental probability the placebo pill induced better concentration on the student exams?

1. RuslanHeatt
The experimental probability the placebo pill induced better concentration on the student exams is 0.64
The question has to do with probability.

### What is probability?

Probability is the likelihood of an event occurring.
The probability of an event A is given by
P(A) = number of occurrences of event A/total number of occurrences of all events.

### What is the experimental probability the placebo pill induced better concentration on the student exams?

Given that in the study on the placebo effect on 100 students, 64 were found to perform better on tests after taking a fake pill to improve concentration.
The event A = students performing better.
Since 64 students performed better, the number of occurrences of event A = 64.
Since there were 100 students, the total number of occurrences = 100.
So, P(A) = P(students perform better)
= number of occurrences of event A/total number of occurrences of all events.
= 64/100
= 0.64
So, the experimental probability the placebo pill induced better concentration on the student exams is 0.64